965:
908:. LED lamps often have directional light characteristics. The best of these lamps, as of 2022, are more power-efficient than compact fluorescent lamps and offer lifespans of 30,000 or more hours, reduced if operated at a higher temperature than specified. Incandescent lamps have a typical life of 1,000 hours, and compact fluorescents about 8,000 hours. LED and fluorescent lamps both use phosphors, whose light output declines over their lifetimes. Energy Star specifications requires LED lamps to typically drop less than 10% after 6,000 or more hours of operation, and in the worst case not more than 15%. LED lamps are available with a variety of color properties. The purchase price is higher than most other lamps – although dropping – but the higher efficiency usually makes total cost of ownership (purchase price plus cost of electricity and changing bulbs) lower.
792:
troffer) is replaced with something like an LED panel, the panel must be replaced in its entirety if the LEDs or the driver it contains fail since it is impossible to replace them individually in a practical fashion (although the driver is often separate and so it may be replaced), where as, if only the bulb is replaced with an LED replacement lamp, the lamp can be replaced independently of the fixture should the lamp fail. Some LED replacement lamps require the fixture to be modified such as by electrically removing the fixture's ballast, thus connecting the LED lamp directly to the mains supply; others can work without any modifications to the fixture.
807:
293:, which produce light by an arc between two electrodes in an atmosphere of argon, mercury and other metals, and iodine or bromine. These were among the most efficient white electric lights before LEDs, having a luminous efficacy of 75–100 lm/W and a relatively long bulb lifetime of 6,000–15,000 hours; because they require a 5–7-minute warmup period before they reach full output, metal-halides are not used for residential lighting, but for commercial and industrial wide area lighting and, outdoors, for security lights and streetlights. Like fluorescents, they also contain hazardous mercury.
640:. The most common method is to combine a blue LED emitter with a yellow phosphor, producing a narrow range of blue wavelengths and a broad band of "yellow" wavelengths actually covering the spectrum from green to red. The CRI value can range from less than 70 to over 90, although a wide range of commercial LEDs of this type have a color rendering index around 82. Following successive increases in efficacy, which had reached 210 lm/W on a production basis as of 2021, this type has surpassed the performance of trichromatic LEDs. The phosphors used in white light LEDs can give
796:
727:. Some manufacturers place the LEDs and all circuitry in a glass bulb just like conventional incandescent bulbs, but with a helium gas filling to conduct heat and thus cool the LEDs. Others place the LEDs on a circuit board with an aluminum backing; the aluminum back is connected thermally to the aluminum base of the lamp using thermal paste, and the base is embedded in a melamine plastic shell. Because of the need for convection cooling around an LED lamp, careful consideration is necessary when placing the lamp in an enclosed or poorly vented
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490:, Wisconsin, US, was able to light its new factory interior and exterior almost solely with LEDs. Initial cost was three times that of a traditional mix of incandescent and fluorescent lamps, but the extra cost was recovered within two years via electricity savings, and the lamps should not need replacing for 20 years. In 2009 the Manapakkam,
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grown in field conditions. Plant performance of mint, basil, lentil, lettuce, cabbage, parsley and carrot was measured by assessing both the health and vigor of the plants and the success of the LEDs in promoting growth. Also noticed was profuse flowering of select ornamentals including primula, marigold and stock.
715:. LEDs use much less power for a given light output, but they do produce some heat, and it is concentrated in a very small semiconductor die. Because of their low operating temperature, LED lamps cannot lose much heat via radiation; instead, heat is conducted through the back of the die to a suitably designed
400:) was launched to identify lighting products that meet energy conservation and performance guidelines. Ushio released the first LED filament lamp in 2008. Philips released its first LED lamp in 2009, followed by the world's first 60 W equivalent LED lamp in 2010, and a 75 watt equivalent version in 2011.
2573:
For more than five years, Americans have been doing something decidedly un-American: We've been using less electricity. . . . oday's electronics and appliances are more efficient. New homes are tighter and better insulated. And most important, light-emitting diodes, or LEDs, have replaced traditional
1073:
For
Vitamin D production, LED lamps are better because traditional lamps can’t produce the exact 293 nanometer wavelength needed to boost Vitamin D levels. UVB lamps at 293 nanometers are more effective than other UVB lamps (like 312 nanometer or broadband types) because they provide enough UVB light
791:
or LED spotlight fixtures replacing similar halogen fixtures) or bulbs (such as LED tubes replacing fluorescent tubes inside troffers or LED HID replacement lamps replacing HID bulbs inside HID fixtures) The differences between replacing a fixture and replacing a bulb are that, when a fixture (like a
172:
to operate from mains power lines, and losses from this circuit means that the efficiency of the lamp is lower than the efficiency of the LED chips it uses. The driver circuit may require special features to be compatible with lamp dimmers intended for use on incandescent lamps. Generally the current
392:
program began to label lamps that meet a set of standards for starting time, life expectancy, color, and consistency of performance. The intent of the program is to reduce consumer concerns due to variable quality of products, by providing transparency and standards for the labeling and usability of
1036:
By about 2010 LED technology came to dominate the outdoor lighting industry, as earlier LEDs were not bright enough for outdoor lighting. A study completed in 2014 concluded that color temperature and accuracy of LED lights was easily recognized by consumers, with preference towards LEDs at natural
822:
White-light LED lamps have longer life expectancy and higher efficiency (more light for the same electricity) than most other lighting when used at the proper temperature. LED sources are compact, which gives flexibility in designing lighting fixtures and good control over the distribution of light
652:
Tunable lighting systems employ banks of colored LEDs that can be individually controlled, either using separate banks of each color, or multi-chip LEDs with the colors combined and controlled at the chip level. For example, white LEDs of different color temperatures can be combined to construct an
297:
Considered as energy converters, all these existing lamps are inefficient, emitting more of their input energy as waste heat than as visible light. Global electric lighting in 1997 consumed 2016 terawatthours of energy. Lighting consumes roughly 12% of electrical energy produced by industrialized
1655:
Badly designed LED lamps may flicker. The effect can be seen on a slow motion video of such a lamp. The extent of flicker is based on the quality of the DC power supply built into the lamp structure, usually located in the lamp base. Longer exposures to flickering light contribute to headaches and
1632:
LED emitters are inherently suitable for dimming, because they can operate over a wide range of currents without significant change of color. However, the circuits in LED lamps must be explicitly designed to be dimmable and compatible with particular types of dimmer switch. Otherwise damage to the
892:
of about 14 to 17 lm/W depending on its size and voltage. (Efficacy of incandescent lamps designed for 230 V supplies is less, because the lower supply voltage in north
America is more favorable to efficacy.) According to the European Union standard, an energy-efficient lamp that claims to be
694:
LED drivers are essential components of LED lamps to ensure acceptable lifetime and performance of the lamp. A driver can provide features such as dimming and remote control. LED drivers may be in the same lamp enclosure as the diode array, or remotely mounted from the light-emitting diodes. LED
995:
Light emitting diodes (LEDs) offer efficient electric lighting in desired wavelengths (red + blue) which support greenhouse production in minimum time and with high quality and quantity. As LEDs are cool, plants can be placed very close to light sources without overheating or scorching, requiring
786:
LED lamps are used for both general and special-purpose lighting. Where colored light is needed, LEDs that inherently emit light of a single color require no energy-absorbing filters. LED lamps are commonly available as drop-in replacements for either bulbs or fixtures, replacing either an entire
620:
white LEDs use multiple LED chips emitting red, green, and blue wavelengths. These three colors combine to produce white light. The CRI is poor, typically 25 – 65, due to the narrow range of wavelengths emitted. Higher CRI values can be obtained using more than three LED colors to cover a greater
991:
Experiments revealed surprising performance and production of vegetables and ornamental plants under LED light sources. Many plant species have been assessed in greenhouse trials to make sure that the quality of biomass and biochemical ingredients of such plants is at least comparable with those
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In keeping with the long life claimed for LED lamps, long warranties are offered. However, currently there are no standardized testing procedures set by the
Department of Energy in the United States to prove these assertions by each manufacturer. A typical domestic LED lamp is stated to have an
911:
Several companies offer LED lamps for general lighting purposes. The technology is improving rapidly and new energy-efficient consumer LED lamps are available. As of 2016, in the United States, LED lamps are close to being adopted as the mainstream light source because of the falling prices and
826:
LEDs using the color-mixing principle can emit a wide range of colors by changing the proportions of light generated in each primary color. This allows full color mixing in lamps with LEDs of different colors. Unlike other lighting technologies, LED emission tends to be directional (or at least
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or a color description such as "warm white", "cool white" or "daylight", the operating temperature range, whether the lamp is dimmer compatible, whether the lamp is suitable for humid/damp/wet conditions, and sometimes the equivalent wattage of an incandescent lamp delivering the same output in
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West, Kathleen E.; Jablonski, Michael R.; Warfield, Benjamin; Cecil, Kate S.; James, Mary; Ayers, Melissa A.; Maida, James; Bowen, Charles; Sliney, David H.; Rollag, Mark D.; Hanifin, John P.; Brainard, George C. (1 March 2011). "Blue light from light-emitting diodes elicits a dose-dependent
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effectively bans the manufacturing and importing of most current incandescent lamps. LED lamps have decreased substantially in price, and many varieties are sold with subsidized prices from local utilities. However, in
September 2019 the Trump administration rolled back requirements for new,
767:. Instead of increasing current levels, light output is usually increased by connecting multiple LED emitters in parallel and/or series in one lamp. Solving the problem of efficiency droop would mean that household LED lamps would require fewer LEDs, which would significantly reduce costs.
3699:
Sabzalian
Mohammad R., P. Heydarizadeh, A. Boroomand, M. Agharokh, Mohammad R. Sahba, M. Zahedi and B. Schoefs. 2014. High performance of vegetables, flowers, and medicinal plants in a red-blue LED incubator for indoor plant production. Agronomy for Sustainable Development 34: 879–886
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for the invention of the blue LED. The existence of blue LEDs and high-efficiency LEDs led to the development of the first 'white LED', which employed a phosphor coating to partially convert the emitted blue light to red and green frequencies, creating a light that appears white.
549:(US$ 2.4 billion) of middle class and poor household power bill. The scheme is intended to replace all the incandescent and CFL light bulbs to more efficient LED lights in the nation. To lower the price of LED bulbs government encouraged light bulb production in the nation.
1678:
The long life of LEDs, expected to be about 50 times that of the most common incandescent lamps and significantly longer than fluorescent types, is advantageous for users but will affect manufacturers as it reduces the market for replacements in the distant future.
186:
Some LED lamps are drop-in replacements for incandescent or fluorescent lamps. LED lamps may use multiple LED packages for improved light dispersal, heat dissipation, and overall cost. The text on retail LED lamp packaging may show the light output in lumens, the
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from the incandescent lamps they were replacing. A standard was developed, ANSI C78.377-2008, that specified the recommended color ranges for solid-state lighting products using cool to warm white LEDs with various correlated color temperatures. In June 2008,
3106:
Efremov, A. A.; Bochkareva, N. I.; Gorbunov, R. I.; Lavrinovich, D. A.; Rebane, Y. T.; Tarkhin, D. V.; Shreter, Y. G. (2006). "Effect of the joule heating on the quantum efficiency and choice of thermal conditions for high-power blue InGaN/GaN LEDs".
972:
Newer light fittings with long-lived LEDs built-in, or designed for LED lamps, have been coming into use as the need for compatibility with existing fittings diminishes. Such lighting does not require each bulb to contain circuitry to operate from
823:
with small reflectors or lenses. Because of the small size of LEDs, control of the spatial distribution of illumination is extremely flexible, and the light output and spatial distribution of an LED array can be controlled with no efficiency loss.
831:), which can be either advantageous or disadvantageous, depending on requirements. For applications where non-directional light is required, either a diffuser is used, or multiple individual LED emitters are used to emit in different directions.
1069:
UV LEDs have grown rapidly in recent years because they can be set to emit specific wavelengths of light. Unlike gas discharge or fluorescent lamps, which are limited by their materials, LED wavelengths are determined by the band gap width.
1016:, solar-powered garden or walkway lights, and bicycle lights. Colored LED lamps are now commercially used for traffic signal lamps, where the ability to emit bright light of the required color is essential, and in strings of holiday lights.
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which are directional and require proper orientation during installation as opposed to
Fluorescent tube lamps which emit light in all directions around the tube. Most LED tube lights available can be used in place of T5, T8, T10, or T12
964:
3908:
3709:
Darko E., P. Heydarizadeh, B. Schoefs and
Mohammad R. Sabzalian. 2014. Photosynthesis under artificial light: the shift in primary and secondary metabolites. Philosophical Transactions of the Royal Society B 369: 20130243 (IF:
344:
New LED lights entered the market near the start of the 21st century in the US (Cree) and Japan (Nichia, Panasonic, and
Toshiba), and then starting in 2004 in Korea and China (Samsung, Kingsun, Solstice, Hoyol, and others.)
588:
at a specified temperature, from "warm white" (like an incandescent bulb) at 2700K, to "daylight" at around 6500K. The first LEDs emitted light in a very narrow band of wavelengths, of a color characteristic of the energy
770:
Early suspicions were that the LED droop was caused by elevated temperatures. Scientists showed that temperature was not the root cause of efficiency droop. The mechanism causing efficiency droop was identified in 2007 as
887:
As of 2010 some LED lamps replaced higher wattage bulbs; for example, one manufacturer claimed a 16-watt LED lamp was as bright as a 150 W halogen lamp. A standard general-purpose incandescent bulb emits light at an
313:'s LED indicator lamp. However, early LED lamps were inefficient and could only display deep red colors, making them unsuitable for general lighting and restricting their usage to numeric displays and indicator lights.
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384:
announced the first two standards for solid-state lighting in the United States. These standards detail performance specifications for LED light sources and prescribe test methods for solid-state lighting products.
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1541:
and this causes lower power factors. Low power factors can result in surcharges for commercial energy users; CFL and LED lamps are available with driver circuits to provide any desired power factor, or site-wide
371:
fixture" light bulb, with a design based on their earlier "AmbientLED" consumer product. DOE awarded
Philips the prize after 18 months of extensive testing. Many other similarly efficient products followed.
298:
countries. New technological developments in light-emitting semiconductors, combined with the huge markets for displays and area lighting, encouraged the development of more energy-efficient electric lights.
1056:
with predominantly blue light can cause eye damage, and that some LEDs switch on and off at twice mains frequency, causing malaise in some people, and possibly being misleading with rotating machinery due to
1579:
Reduces maintenance costs – lasts 35 to 50 times longer than incandescent lighting and about 2 to 5 times longer than fluorescent lighting. No lamp-replacements, no ladders, no ongoing disposal program.
3869:
4311:"A Review of the Literature on Light Flicker: Ergonomics, Biological Attributes, Potential Health Effects, and Methods in Which Some LED Lighting May Introduce Flicker", IEEE Standard P1789, February 2010.
601:
to convert some of the light to other colors. The light is not the same as a true black body, giving a different appearance to colors than an incandescent bulb. Color rendering quality is specified by the
512:
in
Finland was hung with 710 LED lamps, each using 2 watts. It has been calculated that these LED lamps paid for themselves in three and a half years, even though the lights run for only 48 days per year.
1546:
can be performed. EU standards requires a power factor better than 0.4 for lamp powers between 2 and 5 watts, better than 0.5 for lamp powers between 5 and 25 watts and above 0.9 for higher power lamps.
117:
An assortment of LED lamps commercially available in 2010: floodlight fixtures (left), reading light (center), household lamps (center right and bottom), and low-power accent light (right) applications
2634:
473:. LEDs were in use at the Casino Breda in The Netherlands, the Vienna State Opera, and the venue for the Shanghai Grand Prix, for example. LED flashlights and headlamps for people were available.
3187:
421:
By 2019 electricity usage in the United States had decreased for at least five straight years, due in part to U.S. electricity consumers replacing incandescent light bulbs with LEDs due to their
3821:
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energy-efficient light bulbs. The Biden administration finalized efficiency regulations in 2023 that require 45 lm/W lighting and will save consumers $ 3 billion per year in electricity costs.
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Some organizations recommend that people should not use bluish-white lamps at night. The American Medical Association argues against using bluish-white LEDs for municipal street lighting.
531:
made several reports available on the results of many pilot projects for municipal outdoor lighting, and many additional streetlight and municipal outdoor lighting projects soon followed.
301:
The first low-powered LEDs were developed in the early 1960s, and only produced light in the low, red frequencies of the spectrum. In 1968, the first commercial LED lamps were introduced:
3720:
275:) on the inside of the tube. These are more efficient than incandescent lights, having a luminous efficacy from 50 to 100 lm/W (depending on the structure, type of phosphor and type of
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3912:
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3314:
The National Museum in Warsaw is also one of the most modern in Europe. (...) The LED system allows to adjust the light to every painting so that its unique qualities are enhanced.
523:
By 2010 mass installations of LED lighting for commercial and public uses were becoming common. LED lamps were used for a number of demonstration projects for outdoor lighting and
2474:
363:
Philips Lighting ceased research on compact fluorescents in 2008 and began devoting the bulk of its research and development budget to solid-state lighting. On 24 September 2009,
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No off-state power draw. The fixture does not use power when it is turned off, with the exception of external controls, whose power should not exceed 0.5 watts in the off state.
2926:
Narendran, Nadarajah; Deng, Lei (2002). "Color rendering properties of LED light sources". In Ferguson, Ian T; Narendran, Nadarajah; Denbaars, Steven P; Park, Yoon-Soo (eds.).
568:" emitter, producing a cone of light with half-power points about 60° from the axis. A laser diode is another form of LED emitter, but produces light by a different mechanism.
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165:
per watt (lm/W) and convert more than half the input power into light. Commercial LED lamps have a lifespan several times longer than both incandescent and fluorescent lamps.
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2740:
Fontoynont, Marc; Miras, Jean Pierre; Angelini, Marco; Chanussot, Jean; Marty, Christophe; Duchêne, Grégory; Novakovski, Leonid; Makita, Kazuaki; Moriyama, Tokayoshi (2013).
542:
LED bulb scheme' to lower India's carbon footprint and save electricity, it distributed 370 million LED bulbs free, by doing so as of March 2022, which resulted in saving of
4777:
3994:
3934:
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1652:
is used to record how a light source renders eight color sample chips, on a scale from 0 to 100. LEDs with CRI below 75 are not recommended for use in indoor lighting.
3287:
3055:
597:
material used to make the LED. LEDs that emit white light are made using two principal methods: either mixing light from multiple LEDs of various colors, or using a
5374:
2565:"Americans Are No Longer Gluttons for Electricity – Thank the LED Bulb: After increasing 10-fold between 1950 and 2010, average residential consumption dipped"
1602:
Light output remains constant over time, only decreasing towards the end of the rated lifetime (at least 35,000 hours or 12 annums based on use of 8 hours per day).
1595:
To qualify for Energy Star certification, LED lighting products must pass a variety of tests to prove that the products will display the following characteristics:
1599:
Brightness is equal to or greater than existing lighting technologies (incandescent or fluorescent) and light is well distributed over the area lit by the fixture.
381:
1020:
are widely used for their long life and small size. Multiple LEDs are used in applications where more light output than available from a single LED is required.
1992:
4386:
Cajochen, Christian; Frey, Sylvia; Anders, Doreen; Späti, Jakub; Bues, Matthias; Pross, Achim; Mager, Ralph; Wirz-Justice, Anna; Stefani, Oliver (1 May 2011).
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LEDs come to full brightness immediately with no warm-up delay. Frequent switching on and off does not reduce life expectancy as with fluorescent lighting.
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White LED lamps have achieved market dominance in applications where high efficiency is important at low power levels. Some of these applications include
2281:
1588:
Offers convenient features – available with dimming on some indoor models and automatic daylight shut-off and motion sensors on some outdoor models.
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80,000) to light 57,000 sq ft (5,300 m) of office space with LEDs. The firm expected the new lighting to pay for itself within 5 years.
1887:
407:, which describes the methods for testing solid-state lighting products for their light output (lumens), efficacy (lumens per watt) and chromaticity.
3433:
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color temperatures. LEDs are now able to match the brightness and warmer color temperature that consumers desire from their outdoor lighting system.
4688:
Krigel, A; Berdugo, M; Picard, E; Levy-Boukris, R; Jaadane, I; Jonet, L; Dernigoghossian, M; Andrieu-Soler, C; Torriglia, A; Behar-Cohen, F (2016).
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3766:"Ultraviolet B Light Emitting Diodes (LEDs) Are More Efficient and Effective in Producing Vitamin D3 in Human Skin Compared to Natural Sunlight"
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and other lamps. Products meeting the competition requirements would use just 17% of the energy used by most incandescent lamps of that time.
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4678:
4015:
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1664:
799:
704:
238:
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1937:
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Nakamura, S.; Mukai, T.; Senoh, M. (1994). "Candela-Class High-Brightness InGaN/AlGaN Double-Heterostructure Blue-Light-Emitting-Diodes".
393:
products available in the market. Energy Star Certified Light Bulbs is a resource for finding and comparing Energy Star qualified lamps.
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is used. Others require rewiring of the fixtures to remove the ballast. An LED tube lamp generally uses many individual Surface-Mounted
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528:
415:
349:
4173:
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2151:
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411:
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The LED's Dark Secret: Solid-state lighting won't supplant the lightbulb until it can overcome the mysterious malady known as droop
3080:
4388:"Evening exposure to a light-emitting diodes (LED)-backlit computer screen affects circadian physiology and cognitive performance"
703:
LED lamps run cooler than their predecessors since there is no electric arc or tungsten filament, but they can still cause burns.
4924:
2528:
2492:
1562:
consumer products. Devices carrying the Energy Star service mark generally use 20–30% less energy than required by US standards.
956:, T8 is D26mm, T10 is D30mm, in lengths of 590 mm (23 in), 1,200 mm (47 in) and 1,500 mm (59 in).
5805:
5782:
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5284:
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2741:
2109:
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5509:
5294:
4741: – a website from the European Commission about the second generation of energy-saving lamps (archived 12 December 2009)
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used), have a longer lifetime of 6,000–15,000 hours, and are widely used for residential and office lighting. However, their
3298:
5504:
5304:
5211:
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is a significant factor in design of solid state lighting equipment. LED lamps are sensitive to excessive heat, like most
2460:
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introduced the highly efficient LED lamps with EU efficiency class A, which requires an efficiency of at least 215 lm/W.
5815:
5810:
5674:
4835:
4579:
4119:
641:
4580:"AMA Adopts Community Guidance to Reduce the Harmful Human and Environmental Effects of High Intensity Street Lighting"
795:
5566:
5334:
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723:, from where it is dissipated via convection. Very high power lamps for industrial uses are frequently equipped with
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4690:"Light-induced retinal damage using different light sources, protocols and rat strains reveals LED phototoxicity"
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from a single LED. Some of the light from the LED is absorbed by the molecules of the phosphor, causing them to
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4962:
4936:
4495:
Fahey, Christopher D.; Zee, Phyllis C. (1 December 2006). "Circadian rhythm sleep disorders and phototherapy".
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Ciugudeanu, Calin; Buzdugan, Mircea; Beu, Dorin; Campianu, Angel; Galatanu, Catalin Daniel (12 December 2019).
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of the LED device close to ambient temperature, since increased temperature reduces light output and can cause
440:
226:
Before the introduction of LED lamps, three types of lamps were used for the bulk of general (white) lighting:
4330:
2278:
775:, which was taken with mixed reaction. A 2013 study conclusively identified Auger recombination as the cause.
505:
In 2009, Audi was the first manufacturer to offer a car that exclusively used LED lighting, the 2009 Audi R8.
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2020:
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The LED lamp market is projected to grow from US$ 75.8 billion in 2020 to US$ 160 billion in 2026.
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3434:"ledlightingsupplier.co.uk – Diese Website steht zum Verkauf! – Informationen zum Thema ledlightingsupplier"
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Lighting North America became the first to submit lamps in the category to replace the standard 60 W A-19 "
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American National Standard for Specifications for the Chromaticity of Solid-State Lighting (SSL) Products
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due to their lower running and lamp replacement costs. However, there have been concerns that the use of
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4078:
3884:"Philips LED Ultra Efficient Light Bulb 2 Pack [White 3000K - E27 Edison Screw] 60W A60 Frosted"
2223:
1811:
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1300:
1061:. These concerns can be addressed by use of appropriate lighting, rather than simple concern with cost.
943:. Some LED tubular lamps are intended to be a drop-in replacement into existing fixtures if appropriate
607:
603:
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produce light with a glowing filament heated by electric current. These are very inefficient, having a
150:
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lamps, which could cause direct ecological impacts as well as indirect impacts such as attracting more
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drivers may require additional components to meet regulations for acceptable AC line harmonic current.
624:
The second method, the basis of most commercially available LED lamps, uses LEDs in conjunction with a
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2350:
1912:
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Is guaranteed – comes with a minimum three-year warranty – far beyond the industry standard.
564:
A significant difference from other light sources is that the light is more directional. An LED is a "
222:, showing improvement in light output per LED over time, with a logarithmic scale on the vertical axis
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Cost comparison for 60 watt incandescent equivalent light bulb (U.S. residential electricity prices)
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422:
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242:
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126:
65:
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In 2007, Audi was the first car manufacturer to offer headlights that solely used LEDs, used in the
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5538:
5521:
5516:
5476:
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4919:
4749:
4607:"LED lighting increases the ecological impact of light pollution irrespective of color temperature"
4532:"Controlling light–dark exposure patterns, rather than sleep schedules, determines circadian phase"
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Kalajian, T. A.; Aldoukhi, A.; Veronikis, A. J.; Persons, K.; Holick, M. F. (13 September 2017).
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3205:
3149:
3132:
2951:
2650:
1773:
1759:
1045:
944:
876:(bayonet fitting) and are made compatible with the voltage supplied to the sockets. They include
732:
4689:
1945:
778:
Some lasers have been adapted as an alternative to LEDs to provide highly focused illumination.
4434:
2843:
New highway connecting Lisbon to Oporto includes first European LED based lighting in a highway
2635:"LEDs for solid state lighting and other emerging applications: status, trends, and challenges"
1530:"average life" of 15,000 hours (15 years at 3 hours/day), and to support 50,000 switch cycles.
121:
5309:
5257:
5229:
5149:
4987:
4975:
4931:
4859:
4805:
4712:
4674:
4636:
4561:
4512:
4459:
4407:
4360:
3803:
3785:
3407:
3358:
2983:
2610:
2542:
Wolverton, Troy (12 March 2016). "Be prepared to say goodbye to the lightbulbs you've loved".
2147:
2061:
1787:
1721:
1720:
Research suggests that the shift to LED street lighting attracts 48% more flying insects than
1691:
1660:
1268:
1237:
1084:
1049:
974:
889:
756:
403:
The Illuminating Engineering Society of North America (IESNA) in 2008 published a documentary
290:
280:
264:
234:
192:
5592:
5526:
5456:
5407:
4958:
4847:
4842:
4704:
4626:
4551:
4543:
4504:
4399:
4352:
3909:"60-Watt Equivalent A15 Dimmable Filament Classic Glass LED Light Bulb, Soft White (3-Pack)"
3793:
3777:
3397:
3350:
3124:
2943:
2642:
2549:
2325:
2184:
2137:
2051:
1767:
1683:
1644:
Color rendering is not identical to that of incandescent lamps, which emit close to perfect
1053:
940:
893:
the equivalent of a 60 W tungsten lamp must have a minimum light output of 806 lumens.
869:
760:
524:
517:
310:
252:
158:
2303:
356:
competition, known as the "L Prize", challenging industry to develop replacements for 60 W
5752:
5711:
5669:
5664:
5499:
5319:
5096:
4825:
4800:
4300:"Characterizing and Minimizing LED Flicker in Lighting Applications" Steven Keeping (2012)
4177:
4106:
3327:
3191:
3172:
2886:
2862:
2378:
2285:
1826:
1801:
613:
509:
445:
302:
284:
1605:
Excellent color quality. The shade of white light appears clear and consistent over time.
4622:
4320:
Open letter from Alex Baker, Lighting Program Manager, Energy Star, dated 22 March 2010.
3393:
3346:
3238:"Laser Lighting: White-light lasers challenge LEDs in directional lighting applications"
3120:
2939:
2180:
667:
97:
5640:
5531:
5422:
5386:
5359:
5329:
5196:
4968:
4815:
4810:
4708:
4667:
4556:
4531:
3798:
3765:
2908:
948:
857:
680:
321:
260:
219:
142:
2704:
2511:"Philips rolls out 12-watt EnduraLED: World's first 60-watt equivalent LED light bulb"
2254:
2040:"Sustainable Lighting-Retrofit Versus Dedicated Luminaires-Light Versus Power Quality"
1753:
173:
waveform contains some amount of distortion, depending on the luminaires' technology.
161:. The most efficient commercially available LED lamps have efficiencies exceeding 200
129:(COB) LED module from an industrial light luminaire, thermally bonded to the heat sink
5799:
5721:
5451:
5354:
5349:
5271:
5172:
5079:
5057:
4883:
4864:
4820:
4606:
2654:
2637:. In Ferguson, Ian T.; Carrano, John C.; Taguchi, Tsunemasa; Ashdown, Ian E. (eds.).
1745:
1707:
929:
A 17 W tube of LEDs which has the same intensity as a 45 W fluorescent tube
873:
810:
Computer-led LED lighting allows enhancement of unique qualities of paintings in the
606:(CRI), and as of 2019 is about 80 for many LED bulbs, and over 95 for more expensive
594:
452:
333:
329:
4403:
4372:
4356:
3642:
3419:
3136:
3004:
2080:"LED LIGHTING MARKET - GROWTH, TRENDS, COVID-19 IMPACT, AND FORECASTS (2021 - 2026)"
5731:
5627:
5622:
5597:
5587:
5548:
5369:
5324:
5052:
5017:
4953:
4911:
4896:
4852:
4724:
4419:
2955:
2763:"LumeLEX™, the first LED product from Lighting Services Inc, launched at LightFair"
1846:
1711:
1620:
1573:
1543:
1534:
1205:
1041:
880:
to rectify the AC power and convert the voltage to an appropriate value, usually a
861:
743:
637:
633:
495:
429:
376:
368:
283:
content makes them a hazard to the environment, and they have to be disposed of as
268:
162:
106:
102:
49:
45:
2371:
462:
released the first car with LED daytime running lights and directionals, the 2004
348:
In the US, the Energy Independence and Security Act (EISA) of 2007 authorized the
2604:
451:
In 2003, the first surgical goggles with LEDs were demonstrated. Audi showed the
5772:
5726:
5602:
5461:
5381:
5189:
5184:
5144:
5116:
5111:
5042:
5037:
5022:
4901:
4547:
3840:"EcoSmart 60-Watt Equivalent Eco-Incandescent A19 Household Light Bulb (4-Pack)"
1872:
1806:
1565:
1555:
877:
724:
691:
from the power supply to the regulated voltage direct current used by the LEDs.
684:
672:
662:
617:
576:
389:
306:
256:
169:
3781:
1636:
925:
5716:
5582:
5577:
5466:
5429:
5412:
5344:
5339:
5314:
5009:
4508:
3739:"Highways Magazine – Public Health England issues LED street lighting warning"
3128:
3042:
2879:
1836:
1781:
1735:
1028:
1013:
986:
585:
520:, Portugal; it included the first European public LED-based lighting highway.
69:
17:
3991:"Cree 60W Equivalent Soft White (2700K) A19 Dimmable LED Light Bulb (4-Pack)"
3789:
2904:"LED bulb scheme has saved Rs 20,000 crore in household power bills: PM Modi"
2065:
5762:
5659:
5612:
5201:
5177:
5106:
5086:
3822:"EcoSmart 60W Equivalent Soft White (2700K) Twister CFL Light Bulb (4-pack)"
1739:
1538:
1004:
844:
728:
716:
470:
4716:
4640:
4565:
4516:
4411:
4364:
4331:
https://www.cree.com/led-components/media/documents/XLamp_Chemical_Comp.pdf
4225:
3807:
3411:
3362:
1967:
476:
In 2006, some of the first LED spotlights for use in stores were released.
241:
of general lighting applications. Incandescent lamps produce a continuous
3056:"Cooling high-power LEDs: The four myths about active vs. passive methods"
2587:"Back to the future: Signify increases the energy efficiency of LED lamps"
2529:"Philips Announces the World's First LED Replacement for the 75-Watt Bulb"
896:
5494:
5434:
5139:
5131:
5101:
5062:
5027:
4980:
4786:
3661:"Trump Administration Reverses Standards For Energy-Efficient Lightbulbs"
3544:"Q&A: How much can I save by replacing incandescent bulbs with CFLs?"
3402:
3377:
3354:
3328:"Designing light-emitting diode arrays for uniform near-field irradiance"
1888:"How Energy-Efficient Light Bulbs Compare with Traditional Incandescents"
1796:
1695:
934:
625:
598:
590:
317:
309:, which was developed under Howard C. Borden and Gerald P. Pighini, and
272:
1008:
LED Flashlight replacement bulb (left), with tungsten equivalent (right)
996:
much less space for intense cultivation than with hot-running lighting.
939:
LED tube lights are designed to physically fit in fixtures intended for
508:
In 2009 the exceptionally large Christmas tree standing in front of the
5446:
5391:
5091:
5069:
2056:
2039:
1831:
788:
558:
491:
480:
463:
364:
353:
53:
4631:
4149:"The Clinton Presidency: Protecting Our Environment and Public Health"
4041:"Average Price of Electricity to Ultimate Customers by End-Use Sector"
2947:
2646:
214:
113:
39:
5074:
5032:
4745:
Some cities are taking another look at LED lighting after AMA warning
2188:
905:
815:
764:
644:
in the range of 2,200 K (dimmed incandescent) up to 7,000 K or more.
325:
237:
of 10–17 lm/W, and also have a short lifetime, typically 1000 hours.
196:
4530:
Appleman, Kenneth; Figueiro, Mariana G.; Rea, Mark S. (1 May 2013).
4387:
4288:
Energy Star Program Requirements for Solid State Lighting Luminaires
418:
would likely mean most light bulbs used in the future would be LED.
3680:"It's Official: Stores Can No Longer Sell Most Incandescent Lights"
3326:
Moreno, Ivan; Avendaño-Alejo, Maximino; Tzonchev, Rumen I. (2006).
1523:
Comparison based on 6 hours use per day (43,800 hours over 20 yrs)
109:
base. The filaments are visible as the eight yellow vertical lines.
5757:
5121:
5047:
3866:"HomeDepot.com: Philips 60-Watt Household Incandescent Light Bulb"
2514:
1993:"Lighting world first: Philips breaks 200 lumens per watt barrier"
1635:
1027:
1003:
963:
924:
895:
843:
805:
794:
742:
666:
575:
439:
213:
120:
112:
96:
2224:
2006 Millennium technology prize awarded to UCSB's Shuji Nakamura
1074:
for Vitamin D without causing skin redness, even at lower doses.
912:
because incandescent lamps are being phased out. In the U.S. the
4438:
1714:(wearing amber-tinted goggles at night to reduce bluish light).
459:
4759:
3152:. Sciencedaily.com (13 January 2009). Retrieved 4 February 2018
1572:
Reduces energy costs – uses at least 75% less energy than
1816:
3695:
3693:
2930:. International Symposium on Optical Science and Technology.
2876:"Seattle Picked to Lead National Effort on LED Street Lights"
2392:
Energy Star Program Requirements for CFLS Partner Commitments
2139:
Photonics, Volume 3: Photonics Technology and Instrumentation
1608:
Efficiency is as good as or better than fluorescent lighting.
584:
General-purpose lighting requires a white light, emulating a
4201:"If Your Appliances Are Avocado, They're Probably not Green"
1710:(exposure to intense bluish white light during the day) and
4755:
4009:"Lightbulbs – LEDs and CFLs offer more choices and savings"
3935:"LED Bulbs: LED Bulb – 9W E27 A60 Thermoplastic Warm White"
2669:"2003 Audi Nuvolari Concept | Car News | Auto123"
2106:"Longevity of light bulbs and how to make them last longer"
1582:
Reduces cooling costs – LEDs produce very little heat.
653:
LED bulb that decreases its color temperature when dimmed.
3721:"LED advancements drive quality of light gains (MAGAZINE)"
2641:. SPIE Proceedings. Vol. 5941. SPIE. p. 594101.
2021:"Philips and Dubai unveil world's most efficient LED bulb"
1671:
electronic components. Also, the presence of incompatible
3496:
Rosenthal, Elisabeth; Barringer, Felicity (29 May 2009).
4460:"Microscopy Resource Center | Olympus Life Science"
2822:"Of the top six in Turku, led a move – HS.fi – Domestic"
787:
fixture (such as LED light panels replacing fluorescent
3965:"60W Equivalent Soft White A19 LED Light Bulb (2-Pack)"
2970:"Philips 4 W, 840 lm lamp, EAN 8719514343801"
1087:
for an efficiency chart comparing various technologies.
848:
A selection of consumer LED lamps available in 2012 as
683:(DC) electrical power and an appropriate circuit as an
4043:. U.S. Energy Information Administration. October 2022
2639:
Fifth International Conference on Solid State Lighting
2407:. Energysavingtrust.org.uk. Retrieved 18 January 2013.
2395:, 4th edition, dated 03/07/08. Retrieved 25 June 2008.
1537:
of 1, but Compact fluorescent and LED lamps use input
755:
The term "efficiency droop" refers to the decrease in
671:
Household LED lamp with its internal LED elements and
2461:"Philips LED 60W 806lm Retrofit with Remote Phosphor"
2324:
Taub, Eric; leora Broydo Vestel (24 September 2009).
2226:. Ia.ucsb.edu (15 June 2006). Retrieved 22 June 2016.
469:
In 2005, an LED lamp was installed to illuminate the
3224:"Laser diodes add intensity to narrow-beam lighting"
2746:
with LEDs: details concerning innovating techniques"
396:
A similar program in the United Kingdom (run by the
5740:
5695:
5636:
5559:
5475:
5400:
5270:
5210:
5158:
5130:
5008:
4910:
4882:
4873:
4793:
4075:"Specification of a typical domestic 9.5W LED lamp"
3194:, By Steven Keeping, Digi-Key Corporation Tech Zone
1640:
Variable color temperature LED array in a floodlamp
1591:
Is durable – will not break like a glass bulb.
410:As of 2016, in the opinion of Noah Horowitz of the
75:
61:
4666:
3464:
2856:Solid-State Lighting GATEWAY Demonstration Results
388:Also in 2008 in the United States and Canada, the
245:of light similar to sunlight, and so produce high
2203:"The Nobel Prize in Physics 2014 – Press release"
263:between two electrodes in a low pressure tube of
3206:"Cause of LED Efficiency Droop Finally Revealed"
2304:"Fans of L.E.D.'s Say This Bulb's Time Has Come"
2237:"List of Top 10 LED light manufacturer in China"
1675:can impair the performance and reduce lifetime.
1533:Incandescent and halogen lamps naturally have a
267:vapor, which is converted to visible light by a
4276:Appendix B: Calculating color rendering metrics
3378:"Color distribution from multicolor LED arrays"
1623:of at least 0.7 for all lamps of 5W or greater.
516:In 2009 a new highway (A29) was inaugurated in
4329:"Cree XLamp LEDs Chemical compatibility" URL:
4062:Standards Development for Solid-State Lighting
3498:"Green Promise Seen in Switch to LED Lighting"
3204:Iveland, Justin; et al. (23 April 2013).
3185:Identifying the Causes of LED Efficiency Droop
2705:"Lumileds LEDs used in Audi headlights - News"
2326:"Build a Better Bulb for a $ 10 Million Prize"
987:Grow light § Light emitting diodes (LEDs)
494:office of the Indian IT company, iGate, spent
4771:
3584:"LED Bulbs for the Home Near the Marketplace"
2778:"Audi's first all-LED headlight in the world"
1648:, as does the sun. A measurement unit called
904:Some models of LED lamps are compatible with
27:Electric light that produces light using LEDs
8:
3160:
3158:
2298:
2296:
2294:
914:Energy Independence and Security Act of 2007
852:for incandescent bulbs in screw-type sockets
32:
3519:"How Long Did You Say That Bulb Would Last"
2419:"The Next Generation of LED Filament Bulbs"
1078:Comparison with other lighting technologies
802:illumination with color mixing LED fixtures
4879:
4778:
4764:
4756:
3252:"LED lighting: Replaceable or disposable?"
2131:
2129:
2127:
636:, emitting light of another color via the
38:
4630:
4555:
4120:"Commission Regulation (EU) No 1194/2012"
3797:
3566:"Integral LED Lamps Criteria Development"
3401:
3150:Smart Lighting: New LED Drops The 'Droop'
2921:
2919:
2606:Light-Emitting Diodes (2nd Edition, 2006)
2055:
336:and Nakamura were later awarded the 2014
149:(LEDs). LED lamps are significantly more
3466:"Green property: energy-efficient bulbs"
3376:Moreno, Ivan; Contreras, Ulises (2007).
2628:
2626:
2598:
2596:
1611:Light comes on instantly when turned on.
1095:
557:LED lamps are often made with arrays of
486:In 2008 Sentry Equipment Corporation in
4247:"Dimming LED lamps: the dos and don'ts"
4014:. ConsumerReports. 2011. Archived from
3096:. EnergyDaily. Retrieved 16 March 2012.
2808:"Audi R8 V10 becomes first all-LED car"
2657:– via www.spiedigitallibrary.org.
2633:Craford, M. George (2 September 2005).
2441:
2439:
1938:"Lightbulb Efficiency Comparison Chart"
1859:
1576:lighting, saving on operating expenses.
4605:Pawson, S.; Bader, M. (October 2014).
2878:(Retrieved 16 July 2010); Scottsdale:
2563:Craven McGinty, Jo (11 October 2019).
2319:
2317:
1702:are ~2,700K (yellow). People who have
31:
4343:suppression of melatonin in humans".
3081:"Philips LED Classic Gasfilled 470lm"
2889:(Retrieved 16 July 2010); Ann Arbor:
2351:"L Prize 60W Replacement Competition"
2239:. TEKLED. 7 June 2013. Archived from
1665:Thermal management of high-power LEDs
800:BAPS Shri Swaminarayan Mandir Atlanta
705:Thermal management of high-power LEDs
180:
7:
4497:Psychiatric Clinics of North America
3477:from the original on 12 January 2022
2603:Schubert, E. Fred (1 January 2006).
1968:"Dubai Lamp | Philips Lighting"
3605:"An LED That Mimics an Old Standby"
2797:, Nitya Varadarajan, 5 October 2009
1633:lamp and/or the dimmer may result.
860:connections and shapes, such as an
210:Light-emitting diode § History
4709:10.1016/j.neuroscience.2016.10.015
2447:"Philips Master LEDbulb 'Glow' 7W"
2381:. Nema.org. Retrieved 2 June 2012.
529:United States Department of Energy
444:LEDs as Christmas illumination in
416:United States Department of Energy
375:Early LED lamps varied greatly in
25:
3678:Tabuchi, Hiroko (1 August 2023).
3643:"Philips Flattens the Light Bulb"
3641:Pachal, Pete (16 December 2013).
3622:Gross, Daniel (5 February 2016).
3603:Wald, Matthew L. (24 June 2010).
3546:. Consumer Reports. 29 March 2010
3164:Stevenson, Richard (August 2009)
1913:"CFLs vs. LEDs: The Better Bulbs"
1558:is an international standard for
856:LED lamps are made with standard
455:concept car with LED headlights.
412:Natural Resources Defense Council
3054:Ed Rodriguez (17 October 2013).
2493:"The 50 Best Inventions of 2009"
1780:
1766:
1752:
1738:
1704:circadian rhythm sleep disorders
1698:is ~5,700K (bluish white) while
414:, new standards proposed by the
181:Light output decreases gradually
168:LED lamps require an electronic
5295:Parabolic aluminized reflector
4404:10.1152/japplphysiol.00165.2011
4357:10.1152/japplphysiol.01413.2009
4290:. (PDF). Retrieved 2 June 2012.
3517:Taub, Eric (11 February 2009).
3463:Lonsdale, Sarah (7 July 2010).
2776:Moore, Alina (10 August 2007).
1944:. 24 March 2015. Archived from
1659:LED life span as a function of
1040:LEDs are increasingly used for
868:shape with a bi-pin base, or a
5240:Hydrargyrum medium-arc iodide
4673:. Cambridge University Press.
4129:. 14 December 2012. p. 13
3295:Warsaw tour Edition nr 5, 2012
3256:Building Design + Construction
2934:. Vol. 4776. p. 61.
2880:"LED Streetlight Installation"
1663:drops at higher temperatures.
1566:Energy Star LED qualifications
900:High-power LED "corn cob" lamp
751:circuit board and Edison screw
354:Bright Tomorrow Lighting Prize
183:over the lifetime of the LED.
1:
4392:Journal of Applied Physiology
4345:Journal of Applied Physiology
3582:Taub, Eric A. (16 May 2010).
3210:Physical Review Letters, 2013
2417:Lin, Judy (5 February 2015).
679:LED chips require controlled
642:correlated color temperatures
4503:(4): 989–1007, abstract ix.
4302:. Retrieved 2 February 2018.
4226:"Energy star products specs"
4199:Alena Tugend (10 May 2008).
3993:. Home Depot. Archived from
3967:. Home Depot. Archived from
3911:. Home Depot. Archived from
3842:. Home Depot. Archived from
3297:. p. 20. Archived from
3005:"Tunable White Led Lighting"
2854:U. S. Department of Energy,
580:LED lamp used in photography
44:A 230-volt LED lamp with an
5485:Automotive light bulb types
5335:Intelligent street lighting
4548:10.1016/j.sleep.2012.12.011
2279:Progress Alerts – 2010
1706:are sometimes treated with
747:Disassembled LED lamp with
687:is required to convert the
648:Color changing LED lighting
83:; 56 years ago
5847:
5248:Hydrargyrum quartz iodide
3782:10.1038/s41598-017-11362-2
2845:, Aveiro 11 September 2009
2723:"Hella Develops Audi LEDs"
2136:Andrews, David L. (2015).
1673:volatile organic compounds
1392:Energy cost over 20 years
984:
960:Lighting designed for LEDs
932:
882:switched-mode power supply
749:switched-mode power supply
660:
610:(100 is the ideal value).
436:Examples of early adoption
316:The first high-brightness
207:
145:that produces light using
5687:Stage lighting instrument
4665:E. Fred Schubert (2006).
4509:10.1016/j.psc.2006.09.009
4077:. Philips. Archived from
3624:"Flicker On, Flicker Off"
3609:New York Times Green Blog
3438:ledlightingsupplier.co.uk
3129:10.1134/S1063782606050162
2619:– via Google Books.
2574:incandescent light bulbs.
2353:. US Department of Energy
2288:, US Department of Energy
1551:Energy Star qualification
1522:
1114:
1111:
1106:
1103:
1101:
559:surface mount LED modules
239:They are being phased out
37:
5748:Battlefield illumination
5505:high-intensity discharge
4937:Electrochemiluminescence
4433:Williams, D. R. (2004).
4174:"History of Energy Star"
3190:13 December 2013 at the
2893:(Retrieved 16 July 2010)
2865:(Retrieved 16 July 2010)
2108:. RobAid. Archived from
763:increases above tens of
707:is required to keep the
5608:Electroluminescent wire
4611:Ecological Applications
4464:olympus-lifescience.com
3171:5 February 2018 at the
2928:Solid State Lighting II
2687:"Audi Nuvolari quattro"
2569:The Wall Street Journal
2259:US Department of Energy
2169:Applied Physics Letters
1690:sources. The effective
1614:No flicker when dimmed.
1544:power factor correction
352:(DOE) to establish the
5806:Energy-saving lighting
5290:Multifaceted reflector
4747:(25 September 2016) –
3743:Highways Magazine (UK)
2984:"Warm white LED light"
2874:for example, Seattle:
2709:Compound Semiconductor
2545:The Charlotte Observer
2405:Energy saving lighting
1641:
1360:Bulb lifetime (years)
1033:
1009:
969:
930:
901:
853:
819:
803:
752:
676:
621:range of wavelengths.
581:
448:
425:and high performance.
338:Nobel Prize in Physics
223:
130:
118:
110:
77:First production
5826:Light-emitting diodes
5680:ellipsoidal reflector
5285:Ellipsoidal reflector
4969:Fluorescent induction
4947:field-induced polymer
4669:Light-Emitting Diodes
4105:1 August 2018 at the
3094:The LED's dark secret
2255:"L-Prize Competition"
2144:John Wiley & Sons
1812:List of light sources
1639:
1424:Cost of bulbs over 20
1031:
1007:
967:
928:
899:
847:
809:
798:
746:
670:
608:high-CRI LED lighting
604:color rendering index
579:
443:
247:Color rendering index
217:
147:light-emitting diodes
124:
116:
100:
5517:Rear position lights
5490:Daytime running lamp
5418:Mechanically powered
5305:Aviation obstruction
3945:on 10 September 2017
3403:10.1364/OE.15.003607
3355:10.1364/AO.45.002265
2609:. E. Fred Schubert.
1842:Solid-state lighting
1646:black-body radiation
1059:stroboscopic effects
1018:LED automotive lamps
850:drop-in replacements
713:catastrophic failure
709:junction temperature
630:complementary colors
350:Department of Energy
320:was demonstrated by
66:Light-emitting diode
48:base (10 watts, 806
5816:Japanese inventions
5811:American inventions
4925:Electron-stimulated
4750:The Washington Post
4623:2014EcoAp..24.1561P
4478:"Circadian Rhythms"
4257:on 8 September 2018
4081:on 18 November 2018
3872:on 5 February 2018.
3828:on 7 November 2014.
3667:. 4 September 2019.
3471:The Daily Telegraph
3444:on 6 September 2012
3394:2007OExpr..15.3607M
3347:2006ApOpt..45.2265M
3240:. 22 February 2017.
3121:2006Semic..40..605E
2940:2002SPIE.4776...61N
2885:28 May 2010 at the
2861:9 June 2010 at the
2499:. 12 November 2009.
2377:8 July 2008 at the
2284:1 June 2008 at the
2181:1994ApPhL..64.1687N
2084:Mordor Intelligence
1822:Photometry (optics)
1797:Headlamp § LED
1115:Incandescent
1098:
1054:LED street lighting
835:Household LED lamps
773:Auger recombination
689:alternating current
536:Government of India
398:Energy Saving Trust
243:black body spectrum
231:Incandescent lights
34:
5768:Luminous gemstones
4942:Electroluminescent
4920:Cathodoluminescent
4205:The New York Times
4100:PF vs. Power in EU
3997:on 7 January 2019.
3971:on 20 October 2017
3915:on 5 February 2018
3846:on 5 February 2018
3770:Scientific Reports
3589:The New York Times
3523:The New York Times
3503:The New York Times
3027:"Warm Glow Effect"
3007:. 15 February 2017
2824:. 19 November 2009
2589:. 9 November 2023.
2330:The New York Times
2308:The New York Times
2243:on 9 October 2014.
2205:. Nobel Foundation
2057:10.3390/su11247125
1876:. 2 December 2015.
1774:Environment portal
1760:Engineering portal
1642:
1490:Total cost per 860
1457:Total cost over 20
1096:
1065:Ultra-Violet lamps
1034:
1010:
970:
931:
902:
854:
820:
804:
753:
733:thermal insulation
699:Thermal management
677:
582:
449:
358:incandescent lamps
334:Hiroshi Amano
330:Isamu Akasaki
326:Nichia Corporation
291:Metal-halide lamps
224:
155:incandescent lamps
131:
119:
111:
5793:
5792:
5310:Balanced-arm lamp
5266:
5265:
5150:Yablochkov candle
5018:Acetylene/Carbide
4988:Radioluminescence
4860:Luminous efficacy
4806:Color temperature
4680:978-1-139-45522-0
4632:10.1890/14-0468.1
4021:on 11 August 2013
3341:(10): 2265–2272.
2948:10.1117/12.452574
2891:LED street lights
2810:. 4 January 2009.
2727:www.photonics.com
2675:. 23 August 2003.
2647:10.1117/12.625918
2616:978-0-9863826-1-1
2112:on 19 August 2015
2104:Damir, B (2012).
2027:. 6 October 2016.
1788:Technology portal
1692:color temperature
1688:affected by light
1661:lumen maintenance
1527:
1526:
1331:Lifespan (hours)
1269:Color temperature
1122:efficient (2023)
1085:luminous efficacy
954:tube designations
941:fluorescent tubes
757:luminous efficacy
675:circuitry exposed
525:LED street lights
423:energy efficiency
235:luminous efficacy
193:color temperature
189:power consumption
159:fluorescent lamps
103:LED filament lamp
95:
94:
16:(Redirected from
5838:
5593:Christmas lights
5527:Safety reflector
5522:Reversing lights
5457:Navigation light
5408:Bicycle lighting
5298:
5251:
5243:
5217:
4976:Photoluminescent
4959:Fluorescent lamp
4932:Chemiluminescent
4880:
4848:Bi-pin lamp base
4843:Lightbulb socket
4780:
4773:
4766:
4757:
4728:
4694:
4684:
4672:
4652:
4651:
4649:
4647:
4634:
4617:(7): 1561–1568.
4602:
4596:
4595:
4593:
4591:
4576:
4570:
4569:
4559:
4527:
4521:
4520:
4492:
4486:
4485:
4474:
4468:
4467:
4456:
4450:
4449:
4447:
4445:
4435:"Sun Fact Sheet"
4430:
4424:
4423:
4398:(5): 1432–1438.
4383:
4377:
4376:
4339:
4333:
4327:
4321:
4318:
4312:
4309:
4303:
4297:
4291:
4285:
4279:
4273:
4267:
4266:
4264:
4262:
4253:. Archived from
4243:
4237:
4236:
4234:
4232:
4222:
4216:
4215:
4213:
4211:
4196:
4190:
4189:
4187:
4185:
4180:on 27 March 2012
4176:. Archived from
4170:
4164:
4163:
4161:
4159:
4145:
4139:
4138:
4136:
4134:
4124:
4116:
4110:
4097:
4091:
4090:
4088:
4086:
4071:
4065:
4059:
4053:
4052:
4050:
4048:
4037:
4031:
4030:
4028:
4026:
4020:
4013:
4005:
3999:
3998:
3987:
3981:
3980:
3978:
3976:
3961:
3955:
3954:
3952:
3950:
3941:. Archived from
3931:
3925:
3924:
3922:
3920:
3905:
3899:
3898:
3896:
3894:
3880:
3874:
3873:
3868:. Archived from
3862:
3856:
3855:
3853:
3851:
3836:
3830:
3829:
3824:. Archived from
3818:
3812:
3811:
3801:
3761:
3755:
3754:
3752:
3750:
3735:
3729:
3728:
3727:. 22 April 2014.
3717:
3711:
3707:
3701:
3697:
3688:
3687:
3675:
3669:
3668:
3657:
3651:
3650:
3638:
3632:
3631:
3619:
3613:
3612:
3600:
3594:
3593:
3579:
3573:
3572:
3570:
3562:
3556:
3555:
3553:
3551:
3540:
3534:
3533:
3531:
3529:
3514:
3508:
3507:
3493:
3487:
3486:
3484:
3482:
3468:
3460:
3454:
3453:
3451:
3449:
3440:. Archived from
3430:
3424:
3423:
3405:
3373:
3367:
3366:
3332:
3323:
3317:
3316:
3311:
3309:
3303:
3292:
3284:
3278:
3277:
3274:ledsmagazine.com
3266:
3260:
3259:
3248:
3242:
3241:
3234:
3228:
3227:
3220:
3214:
3213:
3201:
3195:
3182:
3176:
3162:
3153:
3147:
3141:
3140:
3103:
3097:
3091:
3085:
3084:
3077:
3071:
3070:
3068:
3066:
3051:
3045:
3041:
3039:
3037:
3031:Philips Lighting
3023:
3017:
3016:
3014:
3012:
3001:
2995:
2994:
2992:
2990:
2980:
2974:
2973:
2966:
2960:
2959:
2932:SPIE Proceedings
2923:
2914:
2913:
2900:
2894:
2872:
2866:
2852:
2846:
2840:
2834:
2833:
2831:
2829:
2818:
2812:
2811:
2804:
2798:
2792:
2786:
2785:
2773:
2767:
2766:
2759:
2753:
2752:
2750:
2737:
2731:
2730:
2719:
2713:
2712:
2701:
2695:
2694:
2683:
2677:
2676:
2665:
2659:
2658:
2630:
2621:
2620:
2600:
2591:
2590:
2583:
2577:
2576:
2560:
2554:
2553:
2550:The Mercury News
2539:
2533:
2532:
2525:
2519:
2518:
2507:
2501:
2500:
2489:
2483:
2482:
2479:ledsmagazine.com
2471:
2465:
2464:
2457:
2451:
2450:
2443:
2434:
2433:
2431:
2429:
2414:
2408:
2402:
2396:
2388:
2382:
2369:
2363:
2362:
2360:
2358:
2347:
2341:
2340:
2338:
2336:
2321:
2312:
2311:
2300:
2289:
2276:
2270:
2269:
2267:
2265:
2251:
2245:
2244:
2233:
2227:
2221:
2215:
2214:
2212:
2210:
2199:
2193:
2192:
2189:10.1063/1.111832
2164:
2158:
2157:
2133:
2122:
2121:
2119:
2117:
2101:
2095:
2094:
2092:
2090:
2076:
2070:
2069:
2059:
2035:
2029:
2028:
2017:
2011:
2010:
2008:
2006:
1997:
1989:
1983:
1982:
1980:
1978:
1964:
1958:
1957:
1955:
1953:
1948:on 21 April 2020
1934:
1928:
1927:
1925:
1923:
1917:greenamerica.org
1909:
1903:
1902:
1900:
1898:
1884:
1878:
1877:
1868:"LED revolution"
1864:
1790:
1785:
1784:
1776:
1771:
1770:
1762:
1757:
1756:
1748:
1743:
1742:
1684:circadian rhythm
1560:energy efficient
1493:
1460:
1427:
1395:
1394:@ 16.1 cents/kWh
1363:
1099:
1092:Comparison table
1024:Outdoor lighting
878:driver circuitry
872:(bi-pin cap) or
761:electric current
739:Efficiency droop
572:White light LEDs
548:
546:
311:Monsanto Company
253:Fluorescent lamp
218:Illustration of
153:than equivalent
151:energy-efficient
91:
89:
84:
78:
42:
35:
21:
5846:
5845:
5841:
5840:
5839:
5837:
5836:
5835:
5796:
5795:
5794:
5789:
5753:Bioluminescence
5736:
5705:
5691:
5648:
5632:
5571:
5555:
5471:
5396:
5320:Emergency light
5296:
5262:
5249:
5241:
5215:
5213:
5206:
5154:
5126:
5097:Magnesium torch
5004:
4906:
4875:
4869:
4826:Light pollution
4801:Accent lighting
4789:
4784:
4735:
4692:
4687:
4681:
4664:
4661:
4659:Further reading
4656:
4655:
4645:
4643:
4604:
4603:
4599:
4589:
4587:
4578:
4577:
4573:
4529:
4528:
4524:
4494:
4493:
4489:
4476:
4475:
4471:
4458:
4457:
4453:
4443:
4441:
4432:
4431:
4427:
4385:
4384:
4380:
4341:
4340:
4336:
4328:
4324:
4319:
4315:
4310:
4306:
4298:
4294:
4286:
4282:
4274:
4270:
4260:
4258:
4245:
4244:
4240:
4230:
4228:
4224:
4223:
4219:
4209:
4207:
4198:
4197:
4193:
4183:
4181:
4172:
4171:
4167:
4157:
4155:
4153:The White House
4147:
4146:
4142:
4132:
4130:
4122:
4118:
4117:
4113:
4107:Wayback Machine
4098:
4094:
4084:
4082:
4073:
4072:
4068:
4060:
4056:
4046:
4044:
4039:
4038:
4034:
4024:
4022:
4018:
4011:
4007:
4006:
4002:
3989:
3988:
3984:
3974:
3972:
3963:
3962:
3958:
3948:
3946:
3933:
3932:
3928:
3918:
3916:
3907:
3906:
3902:
3892:
3890:
3882:
3881:
3877:
3864:
3863:
3859:
3849:
3847:
3838:
3837:
3833:
3820:
3819:
3815:
3763:
3762:
3758:
3748:
3746:
3737:
3736:
3732:
3719:
3718:
3714:
3708:
3704:
3698:
3691:
3677:
3676:
3672:
3659:
3658:
3654:
3640:
3639:
3635:
3621:
3620:
3616:
3602:
3601:
3597:
3581:
3580:
3576:
3568:
3564:
3563:
3559:
3549:
3547:
3542:
3541:
3537:
3527:
3525:
3516:
3515:
3511:
3495:
3494:
3490:
3480:
3478:
3462:
3461:
3457:
3447:
3445:
3432:
3431:
3427:
3375:
3374:
3370:
3330:
3325:
3324:
3320:
3307:
3305:
3304:on 9 March 2013
3301:
3290:
3288:"Warsaw Top 10"
3286:
3285:
3281:
3276:. 22 July 2014.
3268:
3267:
3263:
3258:. 17 June 2015.
3250:
3249:
3245:
3236:
3235:
3231:
3222:
3221:
3217:
3203:
3202:
3198:
3192:Wayback Machine
3183:
3179:
3175:. IEEE Spectrum
3173:Wayback Machine
3163:
3156:
3148:
3144:
3105:
3104:
3100:
3092:
3088:
3079:
3078:
3074:
3064:
3062:
3053:
3052:
3048:
3035:
3033:
3025:
3024:
3020:
3010:
3008:
3003:
3002:
2998:
2988:
2986:
2982:
2981:
2977:
2968:
2967:
2963:
2925:
2924:
2917:
2912:. 4 March 2022.
2902:
2901:
2897:
2887:Wayback Machine
2873:
2869:
2863:Wayback Machine
2853:
2849:
2841:
2837:
2827:
2825:
2820:
2819:
2815:
2806:
2805:
2801:
2795:Led'ing the way
2793:
2789:
2775:
2774:
2770:
2761:
2760:
2756:
2751:. TOSHIBA Lamp.
2748:
2739:
2738:
2734:
2721:
2720:
2716:
2703:
2702:
2698:
2685:
2684:
2680:
2667:
2666:
2662:
2632:
2631:
2624:
2617:
2602:
2601:
2594:
2585:
2584:
2580:
2562:
2561:
2557:
2541:
2540:
2536:
2527:
2526:
2522:
2509:
2508:
2504:
2491:
2490:
2486:
2473:
2472:
2468:
2459:
2458:
2454:
2445:
2444:
2437:
2427:
2425:
2416:
2415:
2411:
2403:
2399:
2389:
2385:
2379:Wayback Machine
2370:
2366:
2356:
2354:
2349:
2348:
2344:
2334:
2332:
2323:
2322:
2315:
2310:. 28 July 2008.
2302:
2301:
2292:
2286:Wayback Machine
2277:
2273:
2263:
2261:
2253:
2252:
2248:
2235:
2234:
2230:
2222:
2218:
2208:
2206:
2201:
2200:
2196:
2166:
2165:
2161:
2154:
2135:
2134:
2125:
2115:
2113:
2103:
2102:
2098:
2088:
2086:
2078:
2077:
2073:
2037:
2036:
2032:
2019:
2018:
2014:
2004:
2002:
1995:
1991:
1990:
1986:
1976:
1974:
1966:
1965:
1961:
1951:
1949:
1936:
1935:
1931:
1921:
1919:
1911:
1910:
1906:
1896:
1894:
1886:
1885:
1881:
1866:
1865:
1861:
1856:
1851:
1827:Radiation angle
1802:LED strip light
1786:
1779:
1772:
1765:
1758:
1751:
1744:
1737:
1734:
1728:to port areas.
1630:
1553:
1491:
1458:
1425:
1393:
1361:
1147:Purchase price
1141:
1136:
1131:
1126:
1121:
1094:
1080:
1067:
1042:street lighting
1026:
1002:
989:
983:
962:
937:
923:
842:
840:Sizes and bases
837:
812:National Museum
784:
759:of LEDs as the
741:
701:
665:
659:
650:
574:
555:
544:
543:
510:Turku Cathedral
446:Viborg, Denmark
438:
303:Hewlett-Packard
285:hazardous waste
212:
206:
87:
85:
82:
76:
57:
28:
23:
22:
15:
12:
11:
5:
5844:
5842:
5834:
5833:
5828:
5823:
5818:
5813:
5808:
5798:
5797:
5791:
5790:
5788:
5787:
5786:
5785:
5775:
5770:
5765:
5760:
5755:
5750:
5744:
5742:
5741:Related topics
5738:
5737:
5735:
5734:
5729:
5724:
5719:
5714:
5708:
5706:
5704:
5703:
5700:
5696:
5693:
5692:
5690:
5689:
5684:
5683:
5682:
5672:
5667:
5662:
5657:
5651:
5649:
5647:
5646:
5643:
5637:
5634:
5633:
5631:
5630:
5625:
5620:
5615:
5610:
5605:
5600:
5595:
5590:
5585:
5580:
5574:
5572:
5570:
5569:
5564:
5560:
5557:
5556:
5554:
5553:
5552:
5551:
5541:
5536:
5535:
5534:
5532:retroreflector
5524:
5519:
5514:
5513:
5512:
5507:
5502:
5492:
5487:
5481:
5479:
5473:
5472:
5470:
5469:
5464:
5459:
5454:
5449:
5444:
5443:
5442:
5432:
5427:
5426:
5425:
5420:
5410:
5404:
5402:
5398:
5397:
5395:
5394:
5389:
5387:Track lighting
5384:
5379:
5378:
5377:
5367:
5362:
5360:Recessed light
5357:
5352:
5347:
5342:
5337:
5332:
5330:Gooseneck lamp
5327:
5322:
5317:
5312:
5307:
5302:
5301:
5300:
5292:
5287:
5276:
5274:
5268:
5267:
5264:
5263:
5261:
5260:
5255:
5254:
5253:
5245:
5237:
5227:
5221:
5219:
5212:High-intensity
5208:
5207:
5205:
5204:
5199:
5194:
5193:
5192:
5182:
5181:
5180:
5170:
5164:
5162:
5156:
5155:
5153:
5152:
5147:
5142:
5136:
5134:
5128:
5127:
5125:
5124:
5119:
5114:
5109:
5104:
5099:
5094:
5089:
5084:
5083:
5082:
5077:
5067:
5066:
5065:
5055:
5050:
5045:
5040:
5035:
5030:
5025:
5020:
5014:
5012:
5006:
5005:
5003:
5002:
5001:
5000:
4990:
4985:
4984:
4983:
4981:Laser headlamp
4973:
4972:
4971:
4966:
4951:
4950:
4949:
4939:
4934:
4929:
4928:
4927:
4916:
4914:
4908:
4907:
4905:
4904:
4899:
4894:
4888:
4886:
4877:
4871:
4870:
4868:
4867:
4862:
4857:
4856:
4855:
4850:
4840:
4839:
4838:
4833:
4823:
4818:
4813:
4811:Electric light
4808:
4803:
4797:
4795:
4791:
4790:
4785:
4783:
4782:
4775:
4768:
4760:
4754:
4753:
4742:
4734:
4733:External links
4731:
4730:
4729:
4685:
4679:
4660:
4657:
4654:
4653:
4597:
4586:. 14 June 2016
4571:
4542:(5): 456–461.
4536:Sleep Medicine
4522:
4487:
4469:
4451:
4425:
4378:
4351:(3): 619–626.
4334:
4322:
4313:
4304:
4292:
4280:
4268:
4238:
4217:
4191:
4165:
4140:
4111:
4092:
4066:
4054:
4032:
4000:
3982:
3956:
3926:
3900:
3875:
3857:
3831:
3813:
3756:
3745:. 3 April 2008
3730:
3712:
3702:
3689:
3684:New York Times
3670:
3652:
3633:
3614:
3595:
3574:
3557:
3535:
3509:
3488:
3455:
3425:
3388:(6): 3607–18.
3382:Optics Express
3368:
3335:Applied Optics
3318:
3279:
3261:
3243:
3229:
3226:. 13 May 2019.
3215:
3196:
3177:
3154:
3142:
3109:Semiconductors
3098:
3086:
3072:
3046:
3018:
2996:
2975:
2961:
2915:
2909:Times of India
2895:
2867:
2847:
2835:
2813:
2799:
2787:
2768:
2765:. 6 June 2006.
2754:
2732:
2714:
2696:
2678:
2660:
2622:
2615:
2592:
2578:
2555:
2534:
2531:. 16 May 2011.
2520:
2502:
2484:
2481:. 14 May 2010.
2466:
2452:
2435:
2409:
2397:
2383:
2364:
2342:
2313:
2290:
2271:
2246:
2228:
2216:
2194:
2159:
2152:
2123:
2096:
2071:
2044:Sustainability
2030:
2012:
1984:
1959:
1942:greatercea.org
1929:
1904:
1879:
1858:
1857:
1855:
1852:
1850:
1849:
1844:
1839:
1834:
1829:
1824:
1819:
1814:
1809:
1804:
1799:
1793:
1792:
1791:
1777:
1763:
1749:
1733:
1730:
1700:tungsten lamps
1629:
1626:
1625:
1624:
1618:
1615:
1612:
1609:
1606:
1603:
1600:
1593:
1592:
1589:
1586:
1583:
1580:
1577:
1552:
1549:
1525:
1524:
1520:
1519:
1516:
1513:
1510:
1507:
1504:
1501:
1498:
1495:
1487:
1486:
1483:
1480:
1477:
1474:
1471:
1468:
1465:
1462:
1454:
1453:
1450:
1447:
1444:
1441:
1438:
1435:
1432:
1429:
1421:
1420:
1417:
1414:
1411:
1408:
1405:
1402:
1399:
1396:
1389:
1388:
1385:
1382:
1379:
1376:
1373:
1370:
1367:
1364:
1357:
1356:
1353:
1350:
1347:
1344:
1341:
1338:
1335:
1332:
1328:
1327:
1324:
1321:
1318:
1315:
1312:
1309:
1306:
1303:
1297:
1296:
1293:
1290:
1287:
1284:
1281:
1278:
1275:
1272:
1265:
1264:
1261:
1258:
1255:
1252:
1249:
1246:
1243:
1240:
1234:
1233:
1230:
1227:
1224:
1221:
1218:
1215:
1212:
1209:
1202:
1201:
1198:
1195:
1192:
1189:
1186:
1183:
1180:
1177:
1173:
1172:
1169:
1166:
1163:
1160:
1157:
1154:
1151:
1148:
1144:
1143:
1138:
1133:
1128:
1123:
1117:
1116:
1113:
1110:
1105:
1102:
1093:
1090:
1079:
1076:
1066:
1063:
1032:LED floodlamps
1025:
1022:
1001:
998:
985:Main article:
982:
979:
961:
958:
933:Main article:
922:
921:LED tube lamps
919:
841:
838:
836:
833:
783:
780:
765:milliamps (mA)
740:
737:
700:
697:
681:direct current
661:Main article:
658:
655:
649:
646:
573:
570:
554:
551:
437:
434:
405:standard LM-79
322:Shuji Nakamura
295:
294:
288:
261:glow discharge
250:
205:
202:
191:in watts, the
143:electric light
127:Chips on board
93:
92:
79:
73:
72:
63:
59:
58:
43:
26:
24:
18:LED light bulb
14:
13:
10:
9:
6:
4:
3:
2:
5843:
5832:
5831:Types of lamp
5829:
5827:
5824:
5822:
5819:
5817:
5814:
5812:
5809:
5807:
5804:
5803:
5801:
5784:
5781:
5780:
5779:
5776:
5774:
5771:
5769:
5766:
5764:
5761:
5759:
5756:
5754:
5751:
5749:
5746:
5745:
5743:
5739:
5733:
5730:
5728:
5725:
5723:
5722:Infrared lamp
5720:
5718:
5715:
5713:
5710:
5709:
5707:
5701:
5698:
5697:
5694:
5688:
5685:
5681:
5678:
5677:
5676:
5673:
5671:
5668:
5666:
5663:
5661:
5658:
5656:
5653:
5652:
5650:
5644:
5642:
5639:
5638:
5635:
5629:
5626:
5624:
5621:
5619:
5616:
5614:
5611:
5609:
5606:
5604:
5601:
5599:
5596:
5594:
5591:
5589:
5586:
5584:
5581:
5579:
5576:
5575:
5573:
5568:
5565:
5562:
5561:
5558:
5550:
5547:
5546:
5545:
5542:
5540:
5537:
5533:
5530:
5529:
5528:
5525:
5523:
5520:
5518:
5515:
5511:
5508:
5506:
5503:
5501:
5498:
5497:
5496:
5493:
5491:
5488:
5486:
5483:
5482:
5480:
5478:
5474:
5468:
5465:
5463:
5460:
5458:
5455:
5453:
5452:Laser pointer
5450:
5448:
5445:
5441:
5438:
5437:
5436:
5433:
5431:
5428:
5424:
5421:
5419:
5416:
5415:
5414:
5411:
5409:
5406:
5405:
5403:
5399:
5393:
5390:
5388:
5385:
5383:
5380:
5376:
5373:
5372:
5371:
5368:
5366:
5363:
5361:
5358:
5356:
5355:Pendant light
5353:
5351:
5350:Neon lighting
5348:
5346:
5343:
5341:
5338:
5336:
5333:
5331:
5328:
5326:
5323:
5321:
5318:
5316:
5313:
5311:
5308:
5306:
5303:
5299:
5293:
5291:
5288:
5286:
5283:
5282:
5281:
5278:
5277:
5275:
5273:
5269:
5259:
5256:
5252:
5246:
5244:
5238:
5236:
5233:
5232:
5231:
5228:
5226:
5225:Mercury-vapor
5223:
5222:
5220:
5218:
5209:
5203:
5200:
5198:
5195:
5191:
5188:
5187:
5186:
5183:
5179:
5176:
5175:
5174:
5171:
5169:
5168:Deuterium arc
5166:
5165:
5163:
5161:
5160:Gas discharge
5157:
5151:
5148:
5146:
5143:
5141:
5138:
5137:
5135:
5133:
5129:
5123:
5120:
5118:
5115:
5113:
5110:
5108:
5105:
5103:
5100:
5098:
5095:
5093:
5090:
5088:
5085:
5081:
5078:
5076:
5073:
5072:
5071:
5068:
5064:
5061:
5060:
5059:
5056:
5054:
5051:
5049:
5046:
5044:
5041:
5039:
5036:
5034:
5031:
5029:
5026:
5024:
5021:
5019:
5016:
5015:
5013:
5011:
5007:
4999:
4996:
4995:
4994:
4991:
4989:
4986:
4982:
4979:
4978:
4977:
4974:
4970:
4967:
4964:
4960:
4957:
4956:
4955:
4952:
4948:
4945:
4944:
4943:
4940:
4938:
4935:
4933:
4930:
4926:
4923:
4922:
4921:
4918:
4917:
4915:
4913:
4909:
4903:
4900:
4898:
4895:
4893:
4890:
4889:
4887:
4885:
4881:
4878:
4872:
4866:
4865:Task lighting
4863:
4861:
4858:
4854:
4851:
4849:
4846:
4845:
4844:
4841:
4837:
4834:
4832:
4829:
4828:
4827:
4824:
4822:
4821:Light fixture
4819:
4817:
4814:
4812:
4809:
4807:
4804:
4802:
4799:
4798:
4796:
4792:
4788:
4781:
4776:
4774:
4769:
4767:
4762:
4761:
4758:
4752:
4751:
4746:
4743:
4740:
4737:
4736:
4732:
4726:
4722:
4718:
4714:
4710:
4706:
4702:
4698:
4691:
4686:
4682:
4676:
4671:
4670:
4663:
4662:
4658:
4642:
4638:
4633:
4628:
4624:
4620:
4616:
4612:
4608:
4601:
4598:
4585:
4581:
4575:
4572:
4567:
4563:
4558:
4553:
4549:
4545:
4541:
4537:
4533:
4526:
4523:
4518:
4514:
4510:
4506:
4502:
4498:
4491:
4488:
4483:
4482:nigms.nih.gov
4479:
4473:
4470:
4465:
4461:
4455:
4452:
4440:
4436:
4429:
4426:
4421:
4417:
4413:
4409:
4405:
4401:
4397:
4393:
4389:
4382:
4379:
4374:
4370:
4366:
4362:
4358:
4354:
4350:
4346:
4338:
4335:
4332:
4326:
4323:
4317:
4314:
4308:
4305:
4301:
4296:
4293:
4289:
4284:
4281:
4278:. lrc.rpi.edu
4277:
4272:
4269:
4256:
4252:
4251:luxreview.com
4248:
4242:
4239:
4227:
4221:
4218:
4206:
4202:
4195:
4192:
4179:
4175:
4169:
4166:
4154:
4150:
4144:
4141:
4128:
4121:
4115:
4112:
4108:
4104:
4101:
4096:
4093:
4080:
4076:
4070:
4067:
4063:
4058:
4055:
4042:
4036:
4033:
4017:
4010:
4004:
4001:
3996:
3992:
3986:
3983:
3970:
3966:
3960:
3957:
3944:
3940:
3936:
3930:
3927:
3914:
3910:
3904:
3901:
3889:
3885:
3879:
3876:
3871:
3867:
3861:
3858:
3845:
3841:
3835:
3832:
3827:
3823:
3817:
3814:
3809:
3805:
3800:
3795:
3791:
3787:
3783:
3779:
3775:
3771:
3767:
3760:
3757:
3744:
3740:
3734:
3731:
3726:
3725:LEDs Magazine
3722:
3716:
3713:
3706:
3703:
3696:
3694:
3690:
3685:
3681:
3674:
3671:
3666:
3662:
3656:
3653:
3648:
3644:
3637:
3634:
3629:
3625:
3618:
3615:
3610:
3606:
3599:
3596:
3591:
3590:
3585:
3578:
3575:
3567:
3561:
3558:
3545:
3539:
3536:
3524:
3520:
3513:
3510:
3505:
3504:
3499:
3492:
3489:
3476:
3472:
3467:
3459:
3456:
3443:
3439:
3435:
3429:
3426:
3421:
3417:
3413:
3409:
3404:
3399:
3395:
3391:
3387:
3383:
3379:
3372:
3369:
3364:
3360:
3356:
3352:
3348:
3344:
3340:
3336:
3329:
3322:
3319:
3315:
3300:
3296:
3289:
3283:
3280:
3275:
3271:
3265:
3262:
3257:
3253:
3247:
3244:
3239:
3233:
3230:
3225:
3219:
3216:
3211:
3207:
3200:
3197:
3193:
3189:
3186:
3181:
3178:
3174:
3170:
3167:
3161:
3159:
3155:
3151:
3146:
3143:
3138:
3134:
3130:
3126:
3122:
3118:
3114:
3110:
3102:
3099:
3095:
3090:
3087:
3082:
3076:
3073:
3061:
3057:
3050:
3047:
3044:
3032:
3028:
3022:
3019:
3006:
3000:
2997:
2985:
2979:
2976:
2971:
2965:
2962:
2957:
2953:
2949:
2945:
2941:
2937:
2933:
2929:
2922:
2920:
2916:
2911:
2910:
2905:
2899:
2896:
2892:
2888:
2884:
2881:
2877:
2871:
2868:
2864:
2860:
2857:
2851:
2848:
2844:
2839:
2836:
2823:
2817:
2814:
2809:
2803:
2800:
2796:
2791:
2788:
2783:
2779:
2772:
2769:
2764:
2758:
2755:
2747:
2745:
2736:
2733:
2728:
2724:
2718:
2715:
2710:
2706:
2700:
2697:
2692:
2688:
2682:
2679:
2674:
2670:
2664:
2661:
2656:
2652:
2648:
2644:
2640:
2636:
2629:
2627:
2623:
2618:
2612:
2608:
2607:
2599:
2597:
2593:
2588:
2582:
2579:
2575:
2570:
2566:
2559:
2556:
2552:. p. 1C.
2551:
2547:
2546:
2538:
2535:
2530:
2524:
2521:
2516:
2512:
2506:
2503:
2498:
2494:
2488:
2485:
2480:
2476:
2470:
2467:
2462:
2456:
2453:
2448:
2442:
2440:
2436:
2424:
2420:
2413:
2410:
2406:
2401:
2398:
2394:
2393:
2387:
2384:
2380:
2376:
2373:
2368:
2365:
2352:
2346:
2343:
2331:
2327:
2320:
2318:
2314:
2309:
2305:
2299:
2297:
2295:
2291:
2287:
2283:
2280:
2275:
2272:
2260:
2256:
2250:
2247:
2242:
2238:
2232:
2229:
2225:
2220:
2217:
2204:
2198:
2195:
2190:
2186:
2182:
2178:
2174:
2170:
2163:
2160:
2155:
2153:9781118225547
2149:
2146:. p. 2.
2145:
2141:
2140:
2132:
2130:
2128:
2124:
2111:
2107:
2100:
2097:
2085:
2081:
2075:
2072:
2067:
2063:
2058:
2053:
2049:
2045:
2041:
2034:
2031:
2026:
2022:
2016:
2013:
2001:
1994:
1988:
1985:
1973:
1969:
1963:
1960:
1947:
1943:
1939:
1933:
1930:
1918:
1914:
1908:
1905:
1893:
1889:
1883:
1880:
1875:
1874:
1869:
1863:
1860:
1853:
1848:
1845:
1843:
1840:
1838:
1835:
1833:
1830:
1828:
1825:
1823:
1820:
1818:
1815:
1813:
1810:
1808:
1805:
1803:
1800:
1798:
1795:
1794:
1789:
1783:
1778:
1775:
1769:
1764:
1761:
1755:
1750:
1747:
1746:Energy portal
1741:
1736:
1731:
1729:
1727:
1723:
1718:
1715:
1713:
1709:
1708:light therapy
1705:
1701:
1697:
1693:
1689:
1685:
1680:
1676:
1674:
1670:
1666:
1662:
1657:
1653:
1651:
1647:
1638:
1634:
1627:
1622:
1619:
1616:
1613:
1610:
1607:
1604:
1601:
1598:
1597:
1596:
1590:
1587:
1584:
1581:
1578:
1575:
1571:
1570:
1569:
1567:
1563:
1561:
1557:
1550:
1548:
1545:
1540:
1536:
1531:
1521:
1517:
1514:
1511:
1508:
1505:
1502:
1499:
1496:
1489:
1488:
1484:
1481:
1478:
1475:
1472:
1469:
1466:
1463:
1456:
1455:
1451:
1448:
1445:
1442:
1439:
1436:
1433:
1430:
1423:
1422:
1418:
1415:
1412:
1409:
1406:
1403:
1400:
1397:
1391:
1390:
1386:
1383:
1380:
1377:
1374:
1371:
1368:
1365:
1362:@ 6 hours/day
1359:
1358:
1354:
1351:
1348:
1345:
1342:
1339:
1336:
1333:
1330:
1329:
1325:
1322:
1319:
1316:
1313:
1310:
1307:
1304:
1302:
1299:
1298:
1294:
1291:
1288:
1285:
1282:
1279:
1276:
1273:
1270:
1267:
1266:
1262:
1259:
1256:
1253:
1250:
1247:
1244:
1241:
1239:
1236:
1235:
1231:
1228:
1225:
1222:
1219:
1216:
1213:
1210:
1207:
1204:
1203:
1199:
1196:
1193:
1190:
1187:
1184:
1181:
1178:
1175:
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5623:Plasma globe
5598:Crackle tube
5588:Bubble light
5549:trafficators
5544:Turn signals
5370:Street light
5325:Gas lighting
5258:Sodium vapor
5230:Metal-halide
5132:Electric arc
4997:
4884:Incandescent
4853:Edison screw
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4584:ama-assn.org
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2110:the original
2099:
2089:25 September
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2033:
2025:newatlas.com
2024:
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1971:
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1946:the original
1941:
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1847:Spectroscopy
1719:
1716:
1712:dark therapy
1681:
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1656:eye strain.
1654:
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1621:Power factor
1594:
1574:incandescent
1564:
1554:
1535:power factor
1532:
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1050:sodium lamps
1044:in place of
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862:Edison screw
855:
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782:Applications
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731:or close to
725:cooling fans
702:
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623:
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369:Edison screw
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225:
185:
178:
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138:
134:
132:
29:
5773:Signal lamp
5727:Stroboscope
5603:DJ lighting
5539:Stop lights
5510:sealed beam
5462:Searchlight
5202:Xenon flash
5145:Klieg light
4993:Solid-state
4954:Fluorescent
4912:Luminescent
4703:: 296–307.
4231:4 September
3270:"StackPath"
3060:EDN Network
3011:15 February
2673:auto123.com
2475:"StackPath"
2428:17 February
2000:Philips.com
1873:India Today
1807:LED display
1726:gypsy moths
1669:solid state
1628:Limitations
1556:Energy Star
1238:lumens/watt
1014:flashlights
721:cooling fin
663:LED circuit
657:LED drivers
628:to produce
547:200 billion
498:3,700,000 (
390:Energy Star
307:LED display
269:fluorescent
259:light by a
257:ultraviolet
220:Haitz's law
170:LED circuit
101:A 230-volt
5800:Categories
5717:Grow light
5712:Germicidal
5702:Scientific
5699:Industrial
5655:Floodlight
5641:Theatrical
5583:Blacklight
5578:Aroma lamp
5567:Decorative
5477:Automotive
5467:Solar lamp
5430:Glow stick
5413:Flashlight
5345:Nightlight
5340:Light tube
5315:Chandelier
5272:Stationary
5214:discharge
5140:Carbon arc
5010:Combustion
4876:generation
4874:Methods of
4739:e-lumen.eu
4590:4 February
4444:4 February
4261:28 January
4158:4 February
4109:. ledon.at
4085:28 January
4064:energy.gov
4025:21 January
3949:4 February
3919:4 February
3749:19 January
3550:4 February
3473:. London.
3115:(5): 605.
3065:19 January
3036:10 October
2989:4 February
2742:"Lighting
2357:10 October
2335:4 February
2264:11 October
1972:Philips.ae
1952:4 February
1897:4 February
1892:energy.gov
1854:References
1837:Solar lamp
1682:The human
1539:rectifiers
829:Lambertian
685:LED driver
673:LED driver
586:black body
566:Lambertian
553:Technology
538:launched '
488:Oconomowoc
208:See also:
105:, with an
70:light bulb
5821:LED lamps
5783:Reflected
5763:Light art
5675:Spotlight
5660:Footlight
5645:Cinematic
5613:Lava lamp
5375:in the US
5280:Reflector
5197:Xenon arc
5178:Neon lamp
5107:Rushlight
5087:Limelight
4836:Hong Kong
4646:6 January
4133:5 October
4047:9 January
3893:7 January
3888:Amazon UK
3850:9 October
3790:2045-2322
3700:(IF:3.99)
3448:26 August
2828:9 January
2744:Mona Lisa
2691:Autopista
2655:119804533
2423:LEDinside
2209:7 October
2116:10 August
2066:2071-1050
1922:31 August
1000:Specialty
864:base, an
729:luminaire
717:heat sink
634:fluoresce
471:Mona Lisa
458:In 2004,
328:in 1994.
271:coating (
139:LED light
5495:Headlamp
5435:Headlamp
5423:Tactical
5401:Portable
5382:Torchère
5063:Petromax
5058:Kerosene
5028:Campfire
4998:LED lamp
4794:Concepts
4787:Lighting
4717:27751961
4641:29210222
4566:23481485
4517:17118278
4412:21415172
4373:23119076
4365:21164152
4184:27 March
4103:Archived
3975:4 August
3939:v-tac.eu
3808:28904394
3647:Mashable
3475:Archived
3420:35468615
3412:19532605
3363:16607994
3188:Archived
3169:Archived
3137:96989485
3043:teardown
2883:Archived
2859:Archived
2782:TopSpeed
2375:Archived
2282:Archived
2005:2 August
1977:2 August
1732:See also
1696:daylight
1125:EcoSmart
1112:Halogen
935:LED tube
890:efficacy
789:troffers
626:phosphor
599:phosphor
591:band gap
534:In 2016
428:In 2023
318:blue LED
273:phosphor
255:produce
200:lumens.
135:LED lamp
33:LED lamp
5778:Sources
5732:Tanning
5618:Marquee
5563:Display
5447:Lantern
5440:outdoor
5392:Troffer
5235:ceramic
5092:Luchina
5070:Lantern
4963:compact
4961: (
4897:Halogen
4892:Regular
4725:1619530
4619:Bibcode
4557:4304650
4420:4140748
4210:29 June
4127:EUR-Lex
3799:5597604
3528:9 March
3390:Bibcode
3343:Bibcode
3308:1 March
3117:Bibcode
2956:8122222
2936:Bibcode
2177:Bibcode
1832:SMD LED
1686:can be
1494:lumens
1349:10,000
1346:25,000
1343:10,000
1340:20,000
1337:15,000
1334:50,000
1271:kelvin
1208:(mean)
1171:$ 0.41
1168:$ 1.17
1165:$ 1.54
1162:$ 3.93
1159:$ 2.54
1156:$ 1.79
1153:$ 3.29
1150:$ 7.19
1142:(2019)
1137:(2017)
1135:Philips
1132:(2018)
1046:mercury
945:ballast
906:dimmers
593:of the
492:Chennai
481:Audi R8
464:Audi A8
365:Philips
281:mercury
277:ballast
265:mercury
204:History
197:kelvins
125:An 80W
86: (
54:Kelvins
52:, 3000
5500:hidden
5365:Sconce
5190:Sulfur
5185:Plasma
5117:Tilley
5112:Safety
5075:Fanous
5038:Carcel
5033:Candle
5023:Argand
4902:Nernst
4831:Hawaii
4723:
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1518:$ 441
1515:$ 407
1512:$ 118
1492:
1485:$ 441
1482:$ 355
1479:$ 106
1461:years
1459:
1428:years
1426:
1419:$ 423
1416:$ 303
1355:1,000
1352:1,000
1245:123.1
1206:lumens
1176:Watts
981:Plants
816:Warsaw
527:. The
518:Aveiro
249:(CRI).
163:lumens
141:is an
50:lumens
5758:Laser
5670:Scoop
5297:(PAR)
5250:(HQI)
5242:(HMI)
5216:(HID)
5122:Torch
5080:Paper
5048:Flare
4816:Glare
4721:S2CID
4693:(PDF)
4416:S2CID
4369:S2CID
4123:(PDF)
4019:(PDF)
4012:(PDF)
3710:6.23)
3628:Slate
3569:(PDF)
3416:S2CID
3331:(PDF)
3302:(PDF)
3291:(PDF)
3133:S2CID
2952:S2CID
2749:(PDF)
2651:S2CID
2515:ZDNet
1996:(PDF)
1509:$ 79
1506:$ 78
1503:$ 73
1500:$ 60
1497:$ 36
1476:$ 75
1473:$ 73
1470:$ 69
1467:$ 56
1464:$ 35
1452:$ 18
1449:$ 51
1440:$ 13
1434:$ 10
1413:$ 99
1410:$ 67
1407:$ 60
1404:$ 63
1401:$ 46
1398:$ 28
1387:0.46
1384:0.46
1378:11.4
1366:22.8
1295:2700
1292:2920
1289:2700
1286:2700
1283:2700
1280:2700
1277:2700
1274:3000
1263:14.3
1260:17.4
1257:55.4
1254:85.8
1251:94.1
1248:89.6
1130:V-TAC
870:GU5.3
540:Ujala
466:W12.
5665:Gobo
5173:Neon
5043:Diya
4713:PMID
4675:ISBN
4648:2017
4637:PMID
4592:2018
4562:PMID
4513:PMID
4446:2018
4439:NASA
4408:PMID
4361:PMID
4263:2017
4233:2016
4212:2008
4186:2012
4160:2018
4135:2019
4087:2021
4049:2023
4027:2014
3977:2017
3951:2018
3921:2018
3895:2023
3852:2017
3804:PMID
3786:ISSN
3751:2019
3552:2018
3530:2016
3483:2011
3450:2011
3408:PMID
3359:PMID
3310:2013
3067:2019
3038:2018
3013:2017
2991:2018
2830:2012
2611:ISBN
2497:Time
2430:2019
2359:2023
2337:2018
2266:2021
2211:2014
2148:ISBN
2118:2015
2091:2021
2062:ISSN
2007:2019
1979:2019
1954:2018
1924:2016
1899:2018
1446:$ 8
1443:$ 8
1437:$ 5
1431:$ 7
1381:4.6
1375:4.6
1372:9.1
1369:6.8
1326:100
1323:100
1311:80+
1242:210
1232:860
1229:750
1226:775
1223:815
1220:800
1217:806
1214:800
1211:840
1191:9.5
1188:8.5
1182:6.5
1140:Cree
1104:LED
1083:See
1048:and
949:LEDs
874:GU10
866:MR16
858:lamp
500:US$
460:Audi
382:NIST
157:and
88:1968
81:1968
62:Type
5102:Oil
5053:Gas
4705:doi
4701:339
4627:doi
4552:PMC
4544:doi
4505:doi
4400:doi
4396:110
4353:doi
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3794:PMC
3778:doi
3665:NPR
3398:doi
3351:doi
3125:doi
2944:doi
2643:doi
2185:doi
2052:doi
1817:Lux
1722:HPS
1694:of
1650:CRI
1320:82
1317:85
1314:80
1308:80
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1301:CRI
1200:60
1197:43
1194:14
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814:in
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