LED lamp - Knowledge

967: 910:. 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. 753: 794:

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.

809: 290:, 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. 637:. 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 798: 724:. 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 438: 122: 1770: 1756: 665: 98: 574: 741: 1784: 1742: 1639: 928: 1031: 1007: 847: 899: 212: 114: 40: 487:, 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, 994:

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.

712:. 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 397:) 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. 2575:

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

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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

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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

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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

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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

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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

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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

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increases. 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.

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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,

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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.

546:(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. 1680:

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.

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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,

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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".

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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

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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.

833:), 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. 1071:

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.

1018:, 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. 953:

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

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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:

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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.)

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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

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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

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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

310:'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. 179:

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. Light output decreases gradually over the lifetime of the LED.

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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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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

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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.

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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.

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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

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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.

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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

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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.

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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.

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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

2636: 470:. 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. 3189: 418:

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

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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.

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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.

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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:

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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.

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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

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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.

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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.).

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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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Fontoynont, Marc; Miras, Jean Pierre; Angelini, Marco; Chanussot, Jean; Marty, Christophe; Duchêne, Grégory; Novakovski, Leonid; Makita, Kazuaki; Moriyama, Tokayoshi (2013).

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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

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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.

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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

5376: 2567:"Americans Are No Longer Gluttons for Electricity – Thank the LED Bulb: After increasing 10-fold between 1950 and 2010, average residential consumption dipped" 1604:

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).

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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:

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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.

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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.

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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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White LED lamps have achieved market dominance in applications where high efficiency is important at low power levels. Some of these applications include

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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.

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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.

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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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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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Nakamura, S.; Mukai, T.; Senoh, M. (1994). "Candela-Class High-Brightness InGaN/AlGaN Double-Heterostructure Blue-Light-Emitting-Diodes".

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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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The LED's Dark Secret: Solid-state lighting won't supplant the lightbulb until it can overcome the mysterious malady known as droop

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LED lamps run cooler than their predecessors since there is no electric arc or tungsten filament, but they can still cause burns.

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consumer products. Devices carrying the Energy Star service mark generally use 20–30% less energy than required by US standards.

958:, T8 is D26mm, T10 is D30mm, in lengths of 590 mm (23 in), 1,200 mm (47 in) and 1,500 mm (59 in). 5807: 5784: 5681: 5419: 5286: 1705: 808: 3944: 2743: 2111: 5827: 5511: 5296: 4743: – a website from the European Commission about the second generation of energy-saving lamps (archived 12 December 2009) 2376: 276:

used), have a longer lifetime of 6,000–15,000 hours, and are widely used for residential and office lighting. However, their

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is a significant factor in design of solid state lighting equipment. LED lamps are sensitive to excessive heat, like most

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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.

5817: 5812: 5676: 4837: 4581: 4121: 638: 4582:"AMA Adopts Community Guidance to Reduce the Harmful Human and Environmental Effects of High Intensity Street Lighting" 797: 5568: 5336: 2779: 2448: 2420: 185: 3585: 720:, from where it is dissipated via convection. Very high power lamps for industrial uses are frequently equipped with 3567: 3167: 4277: 3681: 3028: 883: 745: 3606: 5688: 5656: 5249: 5236: 4832: 4692:"Light-induced retinal damage using different light sources, protocols and rat strains reveals LED phototoxicity" 1674: 4150: 3885: 3443: 629:

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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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

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Before the introduction of LED lamps, three types of lamps were used for the bulk of general (white) lighting:

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In 2009, Audi was the first manufacturer to offer a car that exclusively used LED lighting, the 2009 Audi R8.

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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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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

5779: 4080: 3886:"Philips LED Ultra Efficient Light Bulb 2 Pack [White 3000K - E27 Edison Screw] 60W A60 Frosted" 2225: 1813: 1651: 1302: 1063:. These concerns can be addressed by use of appropriate lighting, rather than simple concern with cost. 945:. Some LED tubular lamps are intended to be a drop-in replacement into existing fixtures if appropriate 604: 600: 484: 243: 230:

produce light with a glowing filament heated by electric current. These are very inefficient, having a

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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.

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The second method, the basis of most commercially available LED lamps, uses LEDs in conjunction with a

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Is guaranteed – comes with a minimum three-year warranty – far beyond the industry standard.

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A significant difference from other light sources is that the light is more directional. An LED is a "

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Cost comparison for 60 watt incandescent equivalent light bulb (U.S. residential electricity prices)

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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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Kalajian, T. A.; Aldoukhi, A.; Veronikis, A. J.; Persons, K.; Holick, M. F. (13 September 2017).

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Some lasers have been adapted as an alternative to LEDs to provide highly focused illumination.

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New highway connecting Lisbon to Oporto includes first European LED based lighting in a highway

2637:"LEDs for solid state lighting and other emerging applications: status, trends, and challenges" 1532:"average life" of 15,000 hours (15 years at 3 hours/day), and to support 50,000 switch cycles. 121: 5311: 5259: 5231: 5151: 4989: 4977: 4933: 4861: 4807: 4714: 4676: 4638: 4563: 4514: 4461: 4409: 4362: 3805: 3787: 3409: 3360: 2985: 2612: 2544:

Wolverton, Troy (12 March 2016). "Be prepared to say goodbye to the lightbulbs you've loved".

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Research suggests that the shift to LED street lighting attracts 48% more flying insects than

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The Illuminating Engineering Society of North America (IESNA) in 2008 published a documentary

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Color rendering is not identical to that of incandescent lamps, which emit close to perfect

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the equivalent of a 60 W tungsten lamp must have a minimum light output of 806 lumens.

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competition, known as the "L Prize", challenging industry to develop replacements for 60 W

5754: 5713: 5671: 5666: 5501: 5321: 5098: 4827: 4802: 4302:"Characterizing and Minimizing LED Flicker in Lighting Applications" Steven Keeping (2012) 4179: 4108: 3329: 3193: 3174: 2888: 2864: 2380: 2287: 1828: 1803: 610: 506: 442: 299: 281: 1607:

Excellent color quality. The shade of white light appears clear and consistent over time.

4624: 4322:

Open letter from Alex Baker, Lighting Program Manager, Energy Star, dated 22 March 2010.

3395: 3348: 3240:"Laser Lighting: White-light lasers challenge LEDs in directional lighting applications" 3122: 2941: 2182: 664: 97: 5642: 5533: 5424: 5388: 5361: 5331: 5198: 4970: 4817: 4812: 4710: 4669: 4558: 4533: 3800: 3767: 2910: 950: 859: 677: 318: 257: 216: 142: 2706: 2513:"Philips rolls out 12-watt EnduraLED: World's first 60-watt equivalent LED light bulb" 2256: 2042:"Sustainable Lighting-Retrofit Versus Dedicated Luminaires-Light Versus Power Quality" 1755: 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 5801: 5723: 5453: 5356: 5351: 5273: 5174: 5081: 5059: 4885: 4866: 4822: 4608: 2656: 2639:. In Ferguson, Ian T.; Carrano, John C.; Taguchi, Tsunemasa; Ashdown, Ian E. (eds.). 1747: 1709: 931:

A 17 W tube of LEDs which has the same intensity as a 45 W fluorescent tube

875: 812:

Computer-led LED lighting allows enhancement of unique qualities of paintings in the

603:(CRI), and as of 2019 is about 80 for many LED bulbs, and over 95 for more expensive 591: 449: 330: 326: 4405: 4374: 4358: 3644: 3421: 3138: 3006: 2082:"LED LIGHTING MARKET - GROWTH, TRENDS, COVID-19 IMPACT, AND FORECASTS (2021 - 2026)" 5733: 5629: 5624: 5599: 5589: 5550: 5371: 5326: 5054: 5019: 4955: 4913: 4898: 4854: 4726: 4421: 2957: 2765:"LumeLEX™, the first LED product from Lighting Services Inc, launched at LightFair" 1848: 1713: 1622: 1575: 1545: 1536: 1207: 1043: 882:

to rectify the AC power and convert the voltage to an appropriate value, usually a

863: 740: 634: 630: 492: 426: 373: 365: 280:

content makes them a hazard to the environment, and they have to be disposed of as

265: 162: 106: 102: 49: 45: 2373: 459:

released the first car with LED daytime running lights and directionals, the 2004

345:

In the US, the Energy Independence and Security Act (EISA) of 2007 authorized the

2606: 448:

In 2003, the first surgical goggles with LEDs were demonstrated. Audi showed the

5774: 5728: 5604: 5463: 5383: 5191: 5186: 5146: 5118: 5113: 5044: 5039: 5024: 4903: 4549: 3842:"EcoSmart 60-Watt Equivalent Eco-Incandescent A19 Household Light Bulb (4-Pack)" 1874: 1808: 1567: 1557: 879: 721: 688:

from the power supply to the regulated voltage direct current used by the LEDs.

681: 669: 659: 614: 573: 386: 303: 253: 169: 3783: 1638: 927: 5718: 5584: 5579: 5468: 5431: 5414: 5346: 5341: 5316: 5011: 4510: 3741:"Highways Magazine – Public Health England issues LED street lighting warning" 3130: 3044: 2881: 1838: 1783: 1737: 1030: 1015: 988: 582: 517:, Portugal; it included the first European public LED-based lighting highway. 69: 3993:"Cree 60W Equivalent Soft White (2700K) A19 Dimmable LED Light Bulb (4-Pack)" 3791: 2906:"LED bulb scheme has saved Rs 20,000 crore in household power bills: PM Modi" 2067: 5764: 5661: 5614: 5203: 5179: 5108: 5088: 3824:"EcoSmart 60W Equivalent Soft White (2700K) Twister CFL Light Bulb (4-pack)" 1741: 1540: 1006: 846: 725: 713: 467: 4718: 4642: 4567: 4518: 4413: 4366: 4333:

https://www.cree.com/led-components/media/documents/XLamp_Chemical_Comp.pdf

4227: 3809: 3413: 3364: 1969: 473:

In 2006, some of the first LED spotlights for use in stores were released.

238:

of general lighting applications. Incandescent lamps produce a continuous

3058:"Cooling high-power LEDs: The four myths about active vs. passive methods" 2589:"Back to the future: Signify increases the energy efficiency of LED lamps" 2531:"Philips Announces the World's First LED Replacement for the 75-Watt Bulb" 898: 5496: 5436: 5141: 5133: 5103: 5064: 5029: 4982: 4788: 3663:"Trump Administration Reverses Standards For Energy-Efficient Lightbulbs" 3546:"Q&A: How much can I save by replacing incandescent bulbs with CFLs?" 3404: 3379: 3356: 3330:"Designing light-emitting diode arrays for uniform near-field irradiance" 1890:"How Energy-Efficient Light Bulbs Compare with Traditional Incandescents" 1798: 1697: 936: 622: 595: 587: 314: 306:, which was developed under Howard C. Borden and Gerald P. Pighini, and 269: 17: 1010:

LED Flashlight replacement bulb (left), with tungsten equivalent (right)

998:

much less space for intense cultivation than with hot-running lighting.

941:

LED tube lights are designed to physically fit in fixtures intended for

505:

In 2009 the exceptionally large Christmas tree standing in front of the

5448: 5393: 5093: 5071: 2058: 2041: 1833: 790: 555: 488: 477: 460: 361: 350: 53: 4633: 4151:"The Clinton Presidency: Protecting Our Environment and Public Health" 4043:"Average Price of Electricity to Ultimate Customers by End-Use Sector" 2949: 2648: 211: 113: 39: 5076: 5034: 4747:

Some cities are taking another look at LED lighting after AMA warning

2190: 907: 817: 641:

in the range of 2,200 K (dimmed incandescent) up to 7,000 K or more.

322: 234:

of 10–17 lm/W, and also have a short lifetime, typically 1000 hours.

193: 4532:

Appleman, Kenneth; Figueiro, Mariana G.; Rea, Mark S. (1 May 2013).

4389: 4290:

Energy Star Program Requirements for Solid State Lighting Luminaires

415:

would likely mean most light bulbs used in the future would be LED.

3682:"It's Official: Stores Can No Longer Sell Most Incandescent Lights" 3328:

Moreno, Ivan; Avendaño-Alejo, Maximino; Tzonchev, Rumen I. (2006).

1525:

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.

5759: 5123: 5049: 3868:"HomeDepot.com: Philips 60-Watt Household Incandescent Light Bulb" 2516: 1995:"Lighting world first: Philips breaks 200 lumens per watt barrier" 1637: 1029: 1005: 965: 926: 897: 845: 807: 796: 751: 739: 663: 572: 436: 210: 120: 112: 96: 2226:

2006 Millennium technology prize awarded to UCSB's Shuji Nakamura

1076:

for Vitamin D without causing skin redness, even at lower doses.

914:

because incandescent lamps are being phased out. In the U.S. the

756:

A graph of the efficiency of an LED compared to the input current

4440: 1716:(wearing amber-tinted goggles at night to reduce bluish light). 456: 4761: 3154:. Sciencedaily.com (13 January 2009). Retrieved 4 February 2018 1574:

Reduces energy costs – uses at least 75% less energy than

1818: 3697: 3695: 2932:. International Symposium on Optical Science and Technology. 2878:"Seattle Picked to Lead National Effort on LED Street Lights" 2394:

Energy Star Program Requirements for CFLS Partner Commitments

2141:

Photonics, Volume 3: Photonics Technology and Instrumentation

1610:

Efficiency is as good as or better than fluorescent lighting.

581:

General-purpose lighting requires a white light, emulating a

4203:"If Your Appliances Are Avocado, They're Probably not Green" 1712:(exposure to intense bluish white light during the day) and 4757: 4011:"Lightbulbs – LEDs and CFLs offer more choices and savings" 3937:"LED Bulbs: LED Bulb – 9W E27 A60 Thermoplastic Warm White" 2671:"2003 Audi Nuvolari Concept | Car News | Auto123" 2108:"Longevity of light bulbs and how to make them last longer" 1584:

Reduces cooling costs – LEDs produce very little heat.

650:

LED bulb that decreases its color temperature when dimmed.

3723:"LED advancements drive quality of light gains (MAGAZINE)" 2643:. SPIE Proceedings. Vol. 5941. SPIE. p. 594101. 2023:"Philips and Dubai unveil world's most efficient LED bulb" 1673:

electronic components. Also, the presence of incompatible

3498:

Rosenthal, Elisabeth; Barringer, Felicity (29 May 2009).

4462:"Microscopy Resource Center | Olympus Life Science" 2824:"Of the top six in Turku, led a move – HS.fi – Domestic" 789:

fixture (such as LED light panels replacing fluorescent

3967:"60W Equivalent Soft White A19 LED Light Bulb (2-Pack)" 2972:"Philips 4 W, 840 lm lamp, EAN 8719514343801" 1089:

for an efficiency chart comparing various technologies.

850:

A selection of consumer LED lamps available in 2012 as

680:(DC) electrical power and an appropriate circuit as an 4045:. U.S. Energy Information Administration. October 2022 2641:

Fifth International Conference on Solid State Lighting

2409:. Energysavingtrust.org.uk. Retrieved 18 January 2013. 2397:, 4th edition, dated 03/07/08. Retrieved 25 June 2008. 1539:

of 1, but Compact fluorescent and LED lamps use input

760:

The term "efficiency droop" refers to the decrease in

668:

Household LED lamp with its internal LED elements and

2463:"Philips LED 60W 806lm Retrofit with Remote Phosphor" 2326:

Taub, Eric; leora Broydo Vestel (24 September 2009).

2228:. Ia.ucsb.edu (15 June 2006). Retrieved 22 June 2016. 466:

In 2005, an LED lamp was installed to illuminate the

3226:"Laser diodes add intensity to narrow-beam lighting" 2748:

with LEDs: details concerning innovating techniques"

393:

A similar program in the United Kingdom (run by the

5742: 5697: 5638: 5561: 5477: 5402: 5272: 5212: 5160: 5132: 5010: 4912: 4884: 4875: 4795: 4077:"Specification of a typical domestic 9.5W LED lamp" 3196:, By Steven Keeping, Digi-Key Corporation Tech Zone 1642:

Variable color temperature LED array in a floodlamp

1593:

Is durable – will not break like a glass bulb.

407:As of 2016, in the opinion of Noah Horowitz of the 75: 61: 4668: 3466: 2858:Solid-State Lighting GATEWAY Demonstration Results 385:Also in 2008 in the United States and Canada, the 242:of light similar to sunlight, and so produce high 2205:"The Nobel Prize in Physics 2014 – Press release" 260:between two electrodes in a low pressure tube of 3208:"Cause of LED Efficiency Droop Finally Revealed" 2306:"Fans of L.E.D.'s Say This Bulb's Time Has Come" 2239:"List of Top 10 LED light manufacturer in China" 1677:can impair the performance and reduce lifetime. 1535:Incandescent and halogen lamps naturally have a 264:vapor, which is converted to visible light by a 4278:Appendix B: Calculating color rendering metrics 3380:"Color distribution from multicolor LED arrays" 1625:of at least 0.7 for all lamps of 5W or greater. 513:In 2009 a new highway (A29) was inaugurated in 4331:"Cree XLamp LEDs Chemical compatibility" URL: 4064:Standards Development for Solid-State Lighting 3500:"Green Promise Seen in Switch to LED Lighting" 3206:Iveland, Justin; et al. (23 April 2013). 3187:Identifying the Causes of LED Efficiency Droop 2707:"Lumileds LEDs used in Audi headlights - News" 2328:"Build a Better Bulb for a $ 10 Million Prize" 989:Grow light § Light emitting diodes (LEDs) 491:office of the Indian IT company, iGate, spent 4773: 3586:"LED Bulbs for the Home Near the Marketplace" 2780:"Audi's first all-LED headlight in the world" 1650:, as does the sun. A measurement unit called 906:Some models of LED lamps are compatible with 27:Electric light that produces light using LEDs 8: 3162: 3160: 2300: 2298: 2296: 916:Energy Independence and Security Act of 2007 854:for incandescent bulbs in screw-type sockets 32: 3521:"How Long Did You Say That Bulb Would Last" 2421:"The Next Generation of LED Filament Bulbs" 1080:Comparison with other lighting technologies 804:illumination with color mixing LED fixtures 4881: 4780: 4766: 4758: 3254:"LED lighting: Replaceable or disposable?" 2133: 2131: 2129: 633:, emitting light of another color via the 38: 4632: 4557: 4122:"Commission Regulation (EU) No 1194/2012" 3799: 3568:"Integral LED Lamps Criteria Development" 3403: 3152:Smart Lighting: New LED Drops The 'Droop' 2923: 2921: 2608:Light-Emitting Diodes (2nd Edition, 2006) 2057: 333:and Nakamura were later awarded the 2014 149:(LEDs). LED lamps are significantly more 3468:"Green property: energy-efficient bulbs" 3378:Moreno, Ivan; Contreras, Ulises (2007). 2630: 2628: 2600: 2598: 1613:Light comes on instantly when turned on. 1097: 554:LED lamps are often made with arrays of 483:In 2008 Sentry Equipment Corporation in 4249:"Dimming LED lamps: the dos and don'ts" 4016:. ConsumerReports. 2011. Archived from 3098:. EnergyDaily. Retrieved 16 March 2012. 2810:"Audi R8 V10 becomes first all-LED car" 2659:– via www.spiedigitallibrary.org. 2635:Craford, M. George (2 September 2005). 2443: 2441: 1940:"Lightbulb Efficiency Comparison Chart" 1861: 1578:lighting, saving on operating expenses. 4607:Pawson, S.; Bader, M. (October 2014). 2880:(Retrieved 16 July 2010); Scottsdale: 2565:Craven McGinty, Jo (11 October 2019). 2321: 2319: 1704:are ~2,700K (yellow). People who have 31: 4345:suppression of melatonin in humans". 3083:"Philips LED Classic Gasfilled 470lm" 2891:(Retrieved 16 July 2010); Ann Arbor: 2353:"L Prize 60W Replacement Competition" 2241:. TEKLED. 7 June 2013. Archived from 1667:Thermal management of high-power LEDs 802:BAPS Shri Swaminarayan Mandir Atlanta 702:Thermal management of high-power LEDs 7: 4499:Psychiatric Clinics of North America 3479:from the original on 12 January 2022 2605:Schubert, E. Fred (1 January 2006). 1970:"Dubai Lamp | Philips Lighting" 3607:"An LED That Mimics an Old Standby" 2799:, Nitya Varadarajan, 5 October 2009 1635:lamp and/or the dimmer may result. 862:connections and shapes, such as an 207:Light-emitting diode § History 4711:10.1016/j.neuroscience.2016.10.015 2449:"Philips Master LEDbulb 'Glow' 7W" 2383:. Nema.org. Retrieved 2 June 2012. 526:United States Department of Energy 441:LEDs as Christmas illumination in 413:United States Department of Energy 372:Early LED lamps varied greatly in 25: 3680:Tabuchi, Hiroko (1 August 2023). 3645:"Philips Flattens the Light Bulb" 3643:Pachal, Pete (16 December 2013). 3624:Gross, Daniel (5 February 2016). 3605:Wald, Matthew L. (24 June 2010). 3548:. Consumer Reports. 29 March 2010 3166:Stevenson, Richard (August 2009) 1915:"CFLs vs. LEDs: The Better Bulbs" 1560:is an international standard for 858:LED lamps are made with standard 452:concept car with LED headlights. 409:Natural Resources Defense Council 3056:Ed Rodriguez (17 October 2013). 2495:"The 50 Best Inventions of 2009" 1782: 1768: 1754: 1740: 1706:circadian rhythm sleep disorders 1700:is ~5,700K (bluish white) while 411:, new standards proposed by the 168:LED lamps require an electronic 5297:Parabolic aluminized reflector 4406:10.1152/japplphysiol.00165.2011 4359:10.1152/japplphysiol.01413.2009 4292:. (PDF). Retrieved 2 June 2012. 3519:Taub, Eric (11 February 2009). 3465:Lonsdale, Sarah (7 July 2010). 2778:Moore, Alina (10 August 2007). 1946:. 24 March 2015. Archived from 1661:LED life span as a function of 1042:LEDs are increasingly used for 870:shape with a bi-pin base, or a 5242:Hydrargyrum medium-arc iodide 4675:. Cambridge University Press. 4131:. 14 December 2012. p. 13 3297:Warsaw tour Edition nr 5, 2012 3258:Building Design + Construction 2936:. Vol. 4776. p. 61. 2882:"LED Streetlight Installation" 1665:drops at higher temperatures. 1568:Energy Star LED qualifications 902:High-power LED "corn cob" lamp 748:circuit board and Edison screw 351:Bright Tomorrow Lighting Prize 1: 4394:Journal of Applied Physiology 4347:Journal of Applied Physiology 3584:Taub, Eric A. (16 May 2010). 3212:Physical Review Letters, 2013 2419:Lin, Judy (5 February 2015). 676:LED chips require controlled 639:correlated color temperatures 4505:(4): 989–1007, abstract ix. 4304:. Retrieved 2 February 2018. 4228:"Energy star products specs" 4201:Alena Tugend (10 May 2008). 3995:. Home Depot. Archived from 3969:. Home Depot. Archived from 3913:. Home Depot. Archived from 3844:. Home Depot. Archived from 3299:. p. 20. Archived from 3007:"Tunable White Led Lighting" 2856:U. S. Department of Energy, 577:LED lamp used in photography 44:A 230-volt LED lamp with an 5487:Automotive light bulb types 5337:Intelligent street lighting 4550:10.1016/j.sleep.2012.12.011 2281:Progress Alerts – 2010 1708:are sometimes treated with 744:Disassembled LED lamp with 684:is required to convert the 645:Color changing LED lighting 83:; 56 years ago 5849: 5250:Hydrargyrum quartz iodide 3784:10.1038/s41598-017-11362-2 2847:, Aveiro 11 September 2009 2725:"Hella Develops Audi LEDs" 2138:Andrews, David L. (2015). 1675:volatile organic compounds 1394:Energy cost over 20 years 986: 962:Lighting designed for LEDs 934: 884:switched-mode power supply 746:switched-mode power supply 657: 607:(100 is the ideal value). 433:Examples of early adoption 313:The first high-brightness 204: 145:that produces light using 5689:Stage lighting instrument 4667:E. Fred Schubert (2006). 4511:10.1016/j.psc.2006.09.009 4079:. Philips. Archived from 3626:"Flicker On, Flicker Off" 3611:New York Times Green Blog 3440:ledlightingsupplier.co.uk 3131:10.1134/S1063782606050162 2621:– via Google Books. 2576:incandescent light bulbs. 2355:. US Department of Energy 2290:, US Department of Energy 1553:Energy Star qualification 1524: 1116: 1113: 1108: 1105: 1103: 556:surface mount LED modules 236:They are being phased out 37: 5750:Battlefield illumination 5507:high-intensity discharge 4939:Electrochemiluminescence 4435:Williams, D. R. (2004). 4176:"History of Energy Star" 3192:13 December 2013 at the 2895:(Retrieved 16 July 2010) 2867:(Retrieved 16 July 2010) 2110:. RobAid. Archived from 704:is required to keep the 5610:Electroluminescent wire 4613:Ecological Applications 4466:olympus-lifescience.com 3173:5 February 2018 at the 2930:Solid State Lighting II 2689:"Audi Nuvolari quattro" 2571:The Wall Street Journal 2261:US Department of Energy 2171:Applied Physics Letters 1692:sources. The effective 1616:No flicker when dimmed. 1546:power factor correction 349:(DOE) to establish the 5808:Energy-saving lighting 5292:Multifaceted reflector 4749:(25 September 2016) – 3745:Highways Magazine (UK) 2986:"Warm white LED light" 2876:for example, Seattle: 2711:Compound Semiconductor 2547:The Charlotte Observer 2407:Energy saving lighting 1643: 1362:Bulb lifetime (years) 1035: 1011: 971: 932: 903: 855: 821: 805: 757: 749: 673: 618:range of wavelengths. 578: 445: 422:and high performance. 335:Nobel Prize in Physics 220: 130: 118: 110: 77:First production 5828:Light-emitting diodes 5682:ellipsoidal reflector 5287:Ellipsoidal reflector 4971:Fluorescent induction 4949:field-induced polymer 4671:Light-Emitting Diodes 4107:1 August 2018 at the 3096:The LED's dark secret 2257:"L-Prize Competition" 2146:John Wiley & Sons 1814:List of light sources 1641: 1426:Cost of bulbs over 20 1033: 1009: 969: 930: 901: 849: 811: 800: 755: 743: 667: 605:high-CRI LED lighting 601:color rendering index 576: 440: 244:Color rendering index 214: 147:light-emitting diodes 124: 116: 100: 5519:Rear position lights 5492:Daytime running lamp 5420:Mechanically powered 5307:Aviation obstruction 3947:on 10 September 2017 3405:10.1364/OE.15.003607 3357:10.1364/AO.45.002265 2611:. E. Fred Schubert. 1844:Solid-state lighting 1648:black-body radiation 1061:stroboscopic effects 1020:LED automotive lamps 852:drop-in replacements 710:catastrophic failure 706:junction temperature 627:complementary colors 347:Department of Energy 317:was demonstrated by 66:Light-emitting diode 48:base (10 watts, 806 5818:Japanese inventions 5813:American inventions 4927:Electron-stimulated 4752:The Washington Post 4625:2014EcoAp..24.1561P 4480:"Circadian Rhythms" 4259:on 8 September 2018 4083:on 18 November 2018 3874:on 5 February 2018. 3830:on 7 November 2014. 3669:. 4 September 2019. 3473:The Daily Telegraph 3446:on 6 September 2012 3396:2007OExpr..15.3607M 3349:2006ApOpt..45.2265M 3242:. 22 February 2017. 3123:2006Semic..40..605E 2942:2002SPIE.4776...61N 2887:28 May 2010 at the 2863:9 June 2010 at the 2501:. 12 November 2009. 2379:8 July 2008 at the 2286:1 June 2008 at the 2183:1994ApPhL..64.1687N 2086:Mordor Intelligence 1824:Photometry (optics) 1799:Headlamp § LED 1117:Incandescent 1100: 1056:LED street lighting 837:Household LED lamps 775:Auger recombination 686:alternating current 533:Government of India 395:Energy Saving Trust 240:black body spectrum 228:Incandescent lights 34: 5770:Luminous gemstones 4944:Electroluminescent 4922:Cathodoluminescent 4207:The New York Times 4102:PF vs. Power in EU 3999:on 7 January 2019. 3973:on 20 October 2017 3917:on 5 February 2018 3848:on 5 February 2018 3772:Scientific Reports 3591:The New York Times 3525:The New York Times 3505:The New York Times 3029:"Warm Glow Effect" 3009:. 15 February 2017 2826:. 19 November 2009 2591:. 9 November 2023. 2332:The New York Times 2310:The New York Times 2245:on 9 October 2014. 2207:. Nobel Foundation 2059:10.3390/su11247125 1878:. 2 December 2015. 1776:Environment portal 1762:Engineering portal 1644: 1492:Total cost per 860 1459:Total cost over 20 1098: 1067:Ultra-Violet lamps 1036: 1012: 972: 933: 904: 856: 822: 806: 758: 750: 730:thermal insulation 696:Thermal management 674: 579: 446: 355:incandescent lamps 331:Hiroshi Amano 327:Isamu Akasaki 323:Nichia Corporation 288:Metal-halide lamps 221: 155:incandescent lamps 131: 119: 111: 5795: 5794: 5312:Balanced-arm lamp 5268: 5267: 5152:Yablochkov candle 5020:Acetylene/Carbide 4990:Radioluminescence 4862:Luminous efficacy 4808:Color temperature 4682:978-1-139-45522-0 4634:10.1890/14-0468.1 4023:on 11 August 2013 3343:(10): 2265–2272. 2950:10.1117/12.452574 2893:LED street lights 2812:. 4 January 2009. 2729:www.photonics.com 2677:. 23 August 2003. 2649:10.1117/12.625918 2618:978-0-9863826-1-1 2114:on 19 August 2015 2106:Damir, B (2012). 2029:. 6 October 2016. 1790:Technology portal 1694:color temperature 1690:affected by light 1663:lumen maintenance 1529: 1528: 1333:Lifespan (hours) 1271:Color temperature 1124:efficient (2023) 1087:luminous efficacy 956:tube designations 943:fluorescent tubes 762:luminous efficacy 672:circuitry exposed 522:LED street lights 420:energy efficiency 232:luminous efficacy 190:color temperature 186:power consumption 159:fluorescent lamps 103:LED filament lamp 95: 94: 16:(Redirected from 5840: 5595:Christmas lights 5529:Safety reflector 5524:Reversing lights 5459:Navigation light 5410:Bicycle lighting 5300: 5253: 5245: 5219: 4978:Photoluminescent 4961:Fluorescent lamp 4934:Chemiluminescent 4882: 4850:Bi-pin lamp base 4845:Lightbulb socket 4782: 4775: 4768: 4759: 4730: 4696: 4686: 4674: 4654: 4653: 4651: 4649: 4636: 4619:(7): 1561–1568. 4604: 4598: 4597: 4595: 4593: 4578: 4572: 4571: 4561: 4529: 4523: 4522: 4494: 4488: 4487: 4476: 4470: 4469: 4458: 4452: 4451: 4449: 4447: 4437:"Sun Fact Sheet" 4432: 4426: 4425: 4400:(5): 1432–1438. 4385: 4379: 4378: 4341: 4335: 4329: 4323: 4320: 4314: 4311: 4305: 4299: 4293: 4287: 4281: 4275: 4269: 4268: 4266: 4264: 4255:. Archived from 4245: 4239: 4238: 4236: 4234: 4224: 4218: 4217: 4215: 4213: 4198: 4192: 4191: 4189: 4187: 4182:on 27 March 2012 4178:. Archived from 4172: 4166: 4165: 4163: 4161: 4147: 4141: 4140: 4138: 4136: 4126: 4118: 4112: 4099: 4093: 4092: 4090: 4088: 4073: 4067: 4061: 4055: 4054: 4052: 4050: 4039: 4033: 4032: 4030: 4028: 4022: 4015: 4007: 4001: 4000: 3989: 3983: 3982: 3980: 3978: 3963: 3957: 3956: 3954: 3952: 3943:. Archived from 3933: 3927: 3926: 3924: 3922: 3907: 3901: 3900: 3898: 3896: 3882: 3876: 3875: 3870:. Archived from 3864: 3858: 3857: 3855: 3853: 3838: 3832: 3831: 3826:. Archived from 3820: 3814: 3813: 3803: 3763: 3757: 3756: 3754: 3752: 3737: 3731: 3730: 3729:. 22 April 2014. 3719: 3713: 3709: 3703: 3699: 3690: 3689: 3677: 3671: 3670: 3659: 3653: 3652: 3640: 3634: 3633: 3621: 3615: 3614: 3602: 3596: 3595: 3581: 3575: 3574: 3572: 3564: 3558: 3557: 3555: 3553: 3542: 3536: 3535: 3533: 3531: 3516: 3510: 3509: 3495: 3489: 3488: 3486: 3484: 3470: 3462: 3456: 3455: 3453: 3451: 3442:. Archived from 3432: 3426: 3425: 3407: 3375: 3369: 3368: 3334: 3325: 3319: 3318: 3313: 3311: 3305: 3294: 3286: 3280: 3279: 3276:ledsmagazine.com 3268: 3262: 3261: 3250: 3244: 3243: 3236: 3230: 3229: 3222: 3216: 3215: 3203: 3197: 3184: 3178: 3164: 3155: 3149: 3143: 3142: 3105: 3099: 3093: 3087: 3086: 3079: 3073: 3072: 3070: 3068: 3053: 3047: 3043: 3041: 3039: 3033:Philips Lighting 3025: 3019: 3018: 3016: 3014: 3003: 2997: 2996: 2994: 2992: 2982: 2976: 2975: 2968: 2962: 2961: 2934:SPIE Proceedings 2925: 2916: 2915: 2902: 2896: 2874: 2868: 2854: 2848: 2842: 2836: 2835: 2833: 2831: 2820: 2814: 2813: 2806: 2800: 2794: 2788: 2787: 2775: 2769: 2768: 2761: 2755: 2754: 2752: 2739: 2733: 2732: 2721: 2715: 2714: 2703: 2697: 2696: 2685: 2679: 2678: 2667: 2661: 2660: 2632: 2623: 2622: 2602: 2593: 2592: 2585: 2579: 2578: 2562: 2556: 2555: 2552:The Mercury News 2541: 2535: 2534: 2527: 2521: 2520: 2509: 2503: 2502: 2491: 2485: 2484: 2481:ledsmagazine.com 2473: 2467: 2466: 2459: 2453: 2452: 2445: 2436: 2435: 2433: 2431: 2416: 2410: 2404: 2398: 2390: 2384: 2371: 2365: 2364: 2362: 2360: 2349: 2343: 2342: 2340: 2338: 2323: 2314: 2313: 2302: 2291: 2278: 2272: 2271: 2269: 2267: 2253: 2247: 2246: 2235: 2229: 2223: 2217: 2216: 2214: 2212: 2201: 2195: 2194: 2191:10.1063/1.111832 2166: 2160: 2159: 2135: 2124: 2123: 2121: 2119: 2103: 2097: 2096: 2094: 2092: 2078: 2072: 2071: 2061: 2037: 2031: 2030: 2019: 2013: 2012: 2010: 2008: 1999: 1991: 1985: 1984: 1982: 1980: 1966: 1960: 1959: 1957: 1955: 1950:on 21 April 2020 1936: 1930: 1929: 1927: 1925: 1919:greenamerica.org 1911: 1905: 1904: 1902: 1900: 1886: 1880: 1879: 1870:"LED revolution" 1866: 1792: 1787: 1786: 1778: 1773: 1772: 1764: 1759: 1758: 1750: 1745: 1744: 1686:circadian rhythm 1562:energy efficient 1495: 1462: 1429: 1397: 1396:@ 16.1 cents/kWh 1365: 1101: 1094:Comparison table 1026:Outdoor lighting 880:driver circuitry 874:(bi-pin cap) or 766:electric current 736:Efficiency droop 569:White light LEDs 545: 543: 308:Monsanto Company 250:Fluorescent lamp 215:Illustration of 153:than equivalent 151:energy-efficient 91: 89: 84: 78: 42: 35: 21: 5848: 5847: 5843: 5842: 5841: 5839: 5838: 5837: 5798: 5797: 5796: 5791: 5755:Bioluminescence 5738: 5707: 5693: 5650: 5634: 5573: 5557: 5473: 5398: 5322:Emergency light 5298: 5264: 5251: 5243: 5217: 5215: 5208: 5156: 5128: 5099:Magnesium torch 5006: 4908: 4877: 4871: 4828:Light pollution 4803:Accent lighting 4791: 4786: 4737: 4694: 4689: 4683: 4666: 4663: 4661:Further reading 4658: 4657: 4647: 4645: 4606: 4605: 4601: 4591: 4589: 4580: 4579: 4575: 4531: 4530: 4526: 4496: 4495: 4491: 4478: 4477: 4473: 4460: 4459: 4455: 4445: 4443: 4434: 4433: 4429: 4387: 4386: 4382: 4343: 4342: 4338: 4330: 4326: 4321: 4317: 4312: 4308: 4300: 4296: 4288: 4284: 4276: 4272: 4262: 4260: 4247: 4246: 4242: 4232: 4230: 4226: 4225: 4221: 4211: 4209: 4200: 4199: 4195: 4185: 4183: 4174: 4173: 4169: 4159: 4157: 4155:The White House 4149: 4148: 4144: 4134: 4132: 4124: 4120: 4119: 4115: 4109:Wayback Machine 4100: 4096: 4086: 4084: 4075: 4074: 4070: 4062: 4058: 4048: 4046: 4041: 4040: 4036: 4026: 4024: 4020: 4013: 4009: 4008: 4004: 3991: 3990: 3986: 3976: 3974: 3965: 3964: 3960: 3950: 3948: 3935: 3934: 3930: 3920: 3918: 3909: 3908: 3904: 3894: 3892: 3884: 3883: 3879: 3866: 3865: 3861: 3851: 3849: 3840: 3839: 3835: 3822: 3821: 3817: 3765: 3764: 3760: 3750: 3748: 3739: 3738: 3734: 3721: 3720: 3716: 3710: 3706: 3700: 3693: 3679: 3678: 3674: 3661: 3660: 3656: 3642: 3641: 3637: 3623: 3622: 3618: 3604: 3603: 3599: 3583: 3582: 3578: 3570: 3566: 3565: 3561: 3551: 3549: 3544: 3543: 3539: 3529: 3527: 3518: 3517: 3513: 3497: 3496: 3492: 3482: 3480: 3464: 3463: 3459: 3449: 3447: 3434: 3433: 3429: 3377: 3376: 3372: 3332: 3327: 3326: 3322: 3309: 3307: 3306:on 9 March 2013 3303: 3292: 3290:"Warsaw Top 10" 3288: 3287: 3283: 3278:. 22 July 2014. 3270: 3269: 3265: 3260:. 17 June 2015. 3252: 3251: 3247: 3238: 3237: 3233: 3224: 3223: 3219: 3205: 3204: 3200: 3194:Wayback Machine 3185: 3181: 3177:. IEEE Spectrum 3175:Wayback Machine 3165: 3158: 3150: 3146: 3107: 3106: 3102: 3094: 3090: 3081: 3080: 3076: 3066: 3064: 3055: 3054: 3050: 3037: 3035: 3027: 3026: 3022: 3012: 3010: 3005: 3004: 3000: 2990: 2988: 2984: 2983: 2979: 2970: 2969: 2965: 2927: 2926: 2919: 2914:. 4 March 2022. 2904: 2903: 2899: 2889:Wayback Machine 2875: 2871: 2865:Wayback Machine 2855: 2851: 2843: 2839: 2829: 2827: 2822: 2821: 2817: 2808: 2807: 2803: 2797:Led'ing the way 2795: 2791: 2777: 2776: 2772: 2763: 2762: 2758: 2753:. TOSHIBA Lamp. 2750: 2741: 2740: 2736: 2723: 2722: 2718: 2705: 2704: 2700: 2687: 2686: 2682: 2669: 2668: 2664: 2634: 2633: 2626: 2619: 2604: 2603: 2596: 2587: 2586: 2582: 2564: 2563: 2559: 2543: 2542: 2538: 2529: 2528: 2524: 2511: 2510: 2506: 2493: 2492: 2488: 2475: 2474: 2470: 2461: 2460: 2456: 2447: 2446: 2439: 2429: 2427: 2418: 2417: 2413: 2405: 2401: 2391: 2387: 2381:Wayback Machine 2372: 2368: 2358: 2356: 2351: 2350: 2346: 2336: 2334: 2325: 2324: 2317: 2312:. 28 July 2008. 2304: 2303: 2294: 2288:Wayback Machine 2279: 2275: 2265: 2263: 2255: 2254: 2250: 2237: 2236: 2232: 2224: 2220: 2210: 2208: 2203: 2202: 2198: 2168: 2167: 2163: 2156: 2137: 2136: 2127: 2117: 2115: 2105: 2104: 2100: 2090: 2088: 2080: 2079: 2075: 2039: 2038: 2034: 2021: 2020: 2016: 2006: 2004: 1997: 1993: 1992: 1988: 1978: 1976: 1968: 1967: 1963: 1953: 1951: 1938: 1937: 1933: 1923: 1921: 1913: 1912: 1908: 1898: 1896: 1888: 1887: 1883: 1868: 1867: 1863: 1858: 1853: 1829:Radiation angle 1804:LED strip light 1788: 1781: 1774: 1767: 1760: 1753: 1746: 1739: 1736: 1730:to port areas. 1632: 1555: 1493: 1460: 1427: 1395: 1363: 1149:Purchase price 1143: 1138: 1133: 1128: 1123: 1096: 1082: 1069: 1044:street lighting 1028: 1004: 991: 985: 964: 939: 925: 844: 842:Sizes and bases 839: 814:National Museum 786: 764:of LEDs as the 738: 698: 662: 656: 647: 571: 552: 541: 540: 507:Turku Cathedral 443:Viborg, Denmark 435: 300:Hewlett-Packard 282:hazardous waste 209: 203: 87: 85: 82: 76: 57: 28: 23: 22: 15: 12: 11: 5: 5846: 5844: 5836: 5835: 5830: 5825: 5820: 5815: 5810: 5800: 5799: 5793: 5792: 5790: 5789: 5788: 5787: 5777: 5772: 5767: 5762: 5757: 5752: 5746: 5744: 5743:Related topics 5740: 5739: 5737: 5736: 5731: 5726: 5721: 5716: 5710: 5708: 5706: 5705: 5702: 5698: 5695: 5694: 5692: 5691: 5686: 5685: 5684: 5674: 5669: 5664: 5659: 5653: 5651: 5649: 5648: 5645: 5639: 5636: 5635: 5633: 5632: 5627: 5622: 5617: 5612: 5607: 5602: 5597: 5592: 5587: 5582: 5576: 5574: 5572: 5571: 5566: 5562: 5559: 5558: 5556: 5555: 5554: 5553: 5543: 5538: 5537: 5536: 5534:retroreflector 5526: 5521: 5516: 5515: 5514: 5509: 5504: 5494: 5489: 5483: 5481: 5475: 5474: 5472: 5471: 5466: 5461: 5456: 5451: 5446: 5445: 5444: 5434: 5429: 5428: 5427: 5422: 5412: 5406: 5404: 5400: 5399: 5397: 5396: 5391: 5389:Track lighting 5386: 5381: 5380: 5379: 5369: 5364: 5362:Recessed light 5359: 5354: 5349: 5344: 5339: 5334: 5332:Gooseneck lamp 5329: 5324: 5319: 5314: 5309: 5304: 5303: 5302: 5294: 5289: 5278: 5276: 5270: 5269: 5266: 5265: 5263: 5262: 5257: 5256: 5255: 5247: 5239: 5229: 5223: 5221: 5214:High-intensity 5210: 5209: 5207: 5206: 5201: 5196: 5195: 5194: 5184: 5183: 5182: 5172: 5166: 5164: 5158: 5157: 5155: 5154: 5149: 5144: 5138: 5136: 5130: 5129: 5127: 5126: 5121: 5116: 5111: 5106: 5101: 5096: 5091: 5086: 5085: 5084: 5079: 5069: 5068: 5067: 5057: 5052: 5047: 5042: 5037: 5032: 5027: 5022: 5016: 5014: 5008: 5007: 5005: 5004: 5003: 5002: 4992: 4987: 4986: 4985: 4983:Laser headlamp 4975: 4974: 4973: 4968: 4953: 4952: 4951: 4941: 4936: 4931: 4930: 4929: 4918: 4916: 4910: 4909: 4907: 4906: 4901: 4896: 4890: 4888: 4879: 4873: 4872: 4870: 4869: 4864: 4859: 4858: 4857: 4852: 4842: 4841: 4840: 4835: 4825: 4820: 4815: 4813:Electric light 4810: 4805: 4799: 4797: 4793: 4792: 4787: 4785: 4784: 4777: 4770: 4762: 4756: 4755: 4744: 4736: 4735:External links 4733: 4732: 4731: 4687: 4681: 4662: 4659: 4656: 4655: 4599: 4588:. 14 June 2016 4573: 4544:(5): 456–461. 4538:Sleep Medicine 4524: 4489: 4471: 4453: 4427: 4380: 4353:(3): 619–626. 4336: 4324: 4315: 4306: 4294: 4282: 4270: 4240: 4219: 4193: 4167: 4142: 4113: 4094: 4068: 4056: 4034: 4002: 3984: 3958: 3928: 3902: 3877: 3859: 3833: 3815: 3758: 3747:. 3 April 2008 3732: 3714: 3704: 3691: 3686:New York Times 3672: 3654: 3635: 3616: 3597: 3576: 3559: 3537: 3511: 3490: 3457: 3427: 3390:(6): 3607–18. 3384:Optics Express 3370: 3337:Applied Optics 3320: 3281: 3263: 3245: 3231: 3228:. 13 May 2019. 3217: 3198: 3179: 3156: 3144: 3111:Semiconductors 3100: 3088: 3074: 3048: 3020: 2998: 2977: 2963: 2917: 2911:Times of India 2897: 2869: 2849: 2837: 2815: 2801: 2789: 2770: 2767:. 6 June 2006. 2756: 2734: 2716: 2698: 2680: 2662: 2624: 2617: 2594: 2580: 2557: 2536: 2533:. 16 May 2011. 2522: 2504: 2486: 2483:. 14 May 2010. 2468: 2454: 2437: 2411: 2399: 2385: 2366: 2344: 2315: 2292: 2273: 2248: 2230: 2218: 2196: 2161: 2154: 2125: 2098: 2073: 2046:Sustainability 2032: 2014: 1986: 1961: 1944:greatercea.org 1931: 1906: 1881: 1860: 1859: 1857: 1854: 1852: 1851: 1846: 1841: 1836: 1831: 1826: 1821: 1816: 1811: 1806: 1801: 1795: 1794: 1793: 1779: 1765: 1751: 1735: 1732: 1702:tungsten lamps 1631: 1628: 1627: 1626: 1620: 1617: 1614: 1611: 1608: 1605: 1602: 1595: 1594: 1591: 1588: 1585: 1582: 1579: 1554: 1551: 1527: 1526: 1522: 1521: 1518: 1515: 1512: 1509: 1506: 1503: 1500: 1497: 1489: 1488: 1485: 1482: 1479: 1476: 1473: 1470: 1467: 1464: 1456: 1455: 1452: 1449: 1446: 1443: 1440: 1437: 1434: 1431: 1423: 1422: 1419: 1416: 1413: 1410: 1407: 1404: 1401: 1398: 1391: 1390: 1387: 1384: 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58: 43: 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 5845: 5834: 5833:Types of lamp 5831: 5829: 5826: 5824: 5821: 5819: 5816: 5814: 5811: 5809: 5806: 5805: 5803: 5786: 5783: 5782: 5781: 5778: 5776: 5773: 5771: 5768: 5766: 5763: 5761: 5758: 5756: 5753: 5751: 5748: 5747: 5745: 5741: 5735: 5732: 5730: 5727: 5725: 5724:Infrared lamp 5722: 5720: 5717: 5715: 5712: 5711: 5709: 5703: 5700: 5699: 5696: 5690: 5687: 5683: 5680: 5679: 5678: 5675: 5673: 5670: 5668: 5665: 5663: 5660: 5658: 5655: 5654: 5652: 5646: 5644: 5641: 5640: 5637: 5631: 5628: 5626: 5623: 5621: 5618: 5616: 5613: 5611: 5608: 5606: 5603: 5601: 5598: 5596: 5593: 5591: 5588: 5586: 5583: 5581: 5578: 5577: 5575: 5570: 5567: 5564: 5563: 5560: 5552: 5549: 5548: 5547: 5544: 5542: 5539: 5535: 5532: 5531: 5530: 5527: 5525: 5522: 5520: 5517: 5513: 5510: 5508: 5505: 5503: 5500: 5499: 5498: 5495: 5493: 5490: 5488: 5485: 5484: 5482: 5480: 5476: 5470: 5467: 5465: 5462: 5460: 5457: 5455: 5454:Laser pointer 5452: 5450: 5447: 5443: 5440: 5439: 5438: 5435: 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