27:
983:
228:, while in other contexts it means luminance. Luminous flux is the total amount of light coming from a source, such as a lighting device. Luminance, the original meaning of brightness, is the amount of light per solid angle coming from an area, such as the sky. The table below shows the standard ways of indicating the amount of light.
213:
since version 6.0 (October 2010) in the
Miscellaneous Symbols and Pictographs block under U+1505 as "low brightness symbol" (🔅) and U+1F506 as "high brightness symbol" (🔆).
86:
171:), "brightness" should now be used only for non-quantitative references to physiological sensations and perceptions of light. Brightness is an antonym of "
255:
53:
of a visual target. The perception is not linear to luminance, and relies on the context of the viewing environment (for example, see
814:
recommend that photometric quantities be denoted with a subscript "v" (for "visual") to avoid confusion with radiometric or
248:
132:
20:
206:
958:
435:
217:
241:
811:
168:
65:
61:
987:
870:
783:
1014:
799:
758:
724:
350:
144:
54:
954:
380:
191:
187:
679:
629:
552:
512:
38:
26:
1009:
297:
120:
920:
221:
71:
1003:
341:
225:
798:" are for length, time and luminous intensity respectively, not the symbols for the
895:
865:
672:
357:
317:
312:
198:
467:
413:
154:
60:
Brightness is a subjective sensation of an object being observed and one of the
875:
763:
567:
458:
46:
937:
420:
361:
202:
176:
149:
93:
50:
220:(FTC) has assigned an unconventional meaning to brightness when applied to
982:
172:
159:
105:
994:
401:
395:
210:
832:
830:
828:
815:
143:"white, bright". "Brightness" was formerly used as a synonym for the
111:
456:
source area. The candela per square metre is sometimes called the
42:
25:
697:
691:
649:
643:
183:
744:
Luminous efficacy normalized by the maximum possible efficacy
488:
482:
30:
Decreasing brightness with depth (underwater photo as example)
909:
Some comments on using the CIECAM97s colour-appearance model
753:
224:. When appearing on light bulb packages, brightness means
115:
with the same meaning via metathesis giving Middle
English
820:
USA Standard Letter
Symbols for Illuminating Engineering
41:
in which a source appears to be radiating or reflecting
74:
137:
124:
92:
from something. This is a different perception than
80:
201:with rays are used to represent the settings of
249:
8:
719:Ratio of luminous flux to power consumption
452:Luminous flux per unit solid angle per unit
925:Federal Glossary of Telecommunication Terms
165:Federal Glossary of Telecommunication Terms
256:
242:
232:
332:The lumen second is sometimes called the
73:
938:"Miscellaneous Symbols and Pictographs"
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775:
96:, which is how light something appears
135:root with a closely related meaning, *
88:. Brightness refers to how much light
277:
273:
270:
267:
7:
836:Alternative symbols sometimes seen:
45:. In other words, brightness is the
852:for luminous efficacy of a source.
782:The symbols in this column denote
14:
923:” in Federal Standard 1037C, the
981:
485:(= lumen per square metre)
896:Bright Definition & Meaning
898:", Merriam-Webster Dictionary.
375:Luminous energy per unit time
186:, brightness is quantified as
100:a similarly lit white object.
1:
606:lumen second per cubic metre
398:(= lumen per steradian)
199:pictograms resembling the Sun
907:Robert William Gainer Hunt:
588:Time-integrated illuminance
209:. They have been encoded in
109:derives from an Old English
943:. Unicode Consortium. 2023.
822:USAS Z7.1-1967, Y10.18-1967
62:color appearance parameters
21:Brightness (disambiguation)
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955:"Shopping for Light Bulbs"
671:Ratio of luminous flux to
153:and (incorrectly) for the
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18:
818:quantities. For example:
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16:Perception of light level
959:Federal Trade Commission
593:Luminous energy density
440:cd/m (= lm/(sr⋅m))
436:candela per square metre
236:SI photometry quantities
218:Federal Trade Commission
848:for luminous flux, and
812:Standards organizations
802:litre, tesla and joule.
727:, luminous coefficient
528:lumen per square metre
412:Luminous flux per unit
163:. As defined by the US
126:
68:, typically denoted as
66:color appearance models
82:
31:
990:at Wikimedia Commons
840:for luminous energy,
515:, luminous emittance
119:. The word is from a
83:
29:
871:Luminance (relative)
131:, ultimately from a
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19:For other uses, see
995:Poynton's Color FAQ
725:Luminous efficiency
264:
37:is an attribute of
381:Luminous intensity
367:lm (= cd⋅sr)
233:
216:The United States
192:absolute magnitude
188:apparent magnitude
78:
32:
986:Media related to
772:
771:
680:Luminous efficacy
630:Luminous efficacy
553:Luminous exposure
513:Luminous exitance
344:, luminous power
81:{\displaystyle Q}
39:visual perception
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90:appears to shine
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55:White's illusion
49:elicited by the
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182:With regard to
121:Common Germanic
103:The adjective
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962:. Retrieved
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866:Luma (video)
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673:radiant flux
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468:Illuminance
414:solid angle
155:radiometric
145:photometric
98:compared to
1015:Photometry
1004:Categories
988:brightness
921:Brightness
882:References
876:Luminosity
784:dimensions
764:Radiometry
759:Photometry
749:See also:
690:lumen per
642:lumen per
568:lux second
47:perception
35:Brightness
964:March 13,
454:projected
421:Luminance
362:steradian
274:Dimension
268:Quantity
203:luminance
150:luminance
94:lightness
51:luminance
860:See also
505:incident
177:dullness
169:FS-1037C
160:radiance
64:of many
794:" and "
609:lm⋅s/m
545:emitted
396:candela
292:Symbol
286:Symbol
211:Unicode
173:dimness
139:bhereg-
127:berhtaz
1010:Vision
927:(1996)
816:photon
334:talbot
278:Notes
175:" or "
112:beorht
106:bright
941:(PDF)
800:units
572:lx⋅s
531:lm/m
358:lumen
289:Name
283:Name
271:Unit
222:lamps
184:stars
157:term
147:term
125:*
117:briht
43:light
966:2017
790:", "
692:watt
644:watt
197:Two
190:and
844:or
786:; "
696:lm/
648:lm/
483:lux
459:nit
320:⋅s
205:in
179:".
133:PIE
57:).
1006::
827:^
754:SI
489:lx
462:.
402:cd
364:)
336:.
318:lm
194:.
968:.
919:“
894:"
850:ρ
846:F
842:P
838:W
796:J
792:T
788:L
740:1
731:V
715:J
713:⋅
711:T
709:⋅
707:L
705:⋅
703:M
698:W
686:η
667:J
665:⋅
663:T
661:⋅
659:L
657:⋅
655:M
650:W
637:K
621:J
619:⋅
617:T
615:⋅
613:L
601:v
598:ω
584:J
582:⋅
580:T
578:⋅
576:L
562:v
559:H
539:J
537:⋅
535:L
523:v
520:M
499:J
497:⋅
495:L
477:v
474:E
448:J
446:⋅
444:L
430:v
427:L
408:J
390:v
387:I
371:J
351:v
348:Φ
328:J
326:⋅
324:T
307:v
304:Q
257:e
250:t
243:v
167:(
76:Q
23:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
