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((anchor|table-si-photometry-units))
{| class="wikitable plainrowheaders"
|+ ((navbar-header |1=((resize|130%|((#if:(({1|))}|Table&nbsp;(({1))}.&nbsp;))SI photometry quantities))|2=SI light units))
|- 
! scope="col" colspan="2" | Quantity
! scope="col" colspan="2" | Unit
! scope="col" rowspan="2" | Dimension<br>((#tag:ref|The symbols in this column denote [[Dimensional analysis#Definition|dimensions]]; "'''L'''", "'''T'''" and "'''J'''" are for length, time and luminous intensity respectively, not the symbols for the [[Unit of measurement|units]] litre, tesla and joule.|group=((#if:(({3|))}|(({3))}|nb))|name=note-dimension-symbol))<!-- [[http://www.bipm.org/utils/common/pdf/si_brochure_8.pdf]] [[http://www.ptb.de/cms/fileadmin/internet/publikationen/DasInternationaleEinheitensystem.pdf]] -->
! scope="col"  rowspan="2" | Notes
|-
! scope="col" | Name
! scope="col" | Symbol((#tag:ref|[[Standards organization]]s recommend that photometric quantities be denoted with a subscript "v" (for "visual") to avoid confusion with radiometric or [[photon]] quantities. For example: ''USA Standard Letter Symbols for Illuminating Engineering'' USAS Z7.1-1967, Y10.18-1967|group=((#if:(({3|))}|(({3))}|nb))|name=note-suffix-v))
! scope="col" | Name
! scope="col" | Symbol
|- 
! scope="row" | [[Luminous energy]]
| ((math|''Q''((sub|v))))((#tag:ref|Alternative symbols sometimes seen: ((mvar|W)) for luminous energy, ((mvar|P)) or ((mvar|F)) for luminous flux, and ((mvar|ρ)) for luminous efficacy of a source.|group=((#if:(({3|))}|(({3))}|nb))|name=note-alternative-symbol-photometric))<!-- Luminous energy alternatives: Q is used throughout literature. Palmer recommends W (typo for E?) as acceptable alternative. -->
| [[lumen second]]
| [[lumen (unit)|lm]]⋅s
| '''T'''⋅'''J'''<!-- STOP! J does not stand for Joules here! This column is dimensions, not units!-->
| The lumen second is sometimes called the ''talbot''.
|- 
! scope="row" | [[Luminous flux]], luminous power
| ((math|Φ((sub|[[Luminosity function|v]]))))((#tag:ref||group=((#if:(({3|))}|(({3))}|nb))|name=note-alternative-symbol-photometric))<!-- Luminous flux alternatives: Phi_v is used throughout the literature, Palmer uses Phi_p as well, but recommends P as acceptable alternative and uses F in HTML docs. P is used in Slovakian WP, F is still partially used in English WP. -->
| [[lumen (unit)|lumen]] (=&nbsp;candela [[steradian]])
| lm (=&nbsp;cd⋅sr)
| '''J'''<!-- STOP! J does not stand for Joules here! This column is dimensions, not units!-->
| Luminous energy per unit time
|- 
! scope="row" | [[Luminous intensity]]
| ((math|''I''((sub|v))))
| [[candela]] (=&nbsp;lumen per steradian)
| [[candela|cd]] (=&nbsp;lm/sr)
| '''J'''<!-- STOP! J does not stand for Joules here! This column is dimensions, not units!-->
| Luminous flux per unit [[solid angle]]
|- 
! scope="row" | [[Luminance]]
| ((math|''L''((sub|v))))
| [[candela per square metre]]
| cd/m((sup|2)) (=&nbsp;lm/(sr⋅m((sup|2))))
| '''L'''((sup|−2))⋅'''J'''
| Luminous flux per unit solid angle per unit ''projected'' source area. The candela per square metre is sometimes called the ''[[nit (unit)|nit]]''.
|- 
! scope="row" | [[Illuminance]]
| ((math|''E''((sub|v))))
| [[lux]] (=&nbsp;lumen per square metre)
| [[lux|lx]] (=&nbsp;lm/m((sup|2)))
| '''L'''((sup|−2))⋅'''J'''
| Luminous flux ''incident'' on a surface
|-
! scope="row" | [[Luminous exitance]], luminous emittance
| ((math|''M''((sub|v))))
| lumen per square metre<!-- lux is defined as lm/m2 but not used for luminous exitance -->
| lm/m((sup|2))
| '''L'''((sup|−2))⋅'''J'''
| Luminous flux ''emitted'' from a surface
|- 
! scope="row" | [[Luminous exposure]]
| ((math|''H''((sub|v))))
| [[lux second]]
| lx⋅s
| '''L'''((sup|−2))⋅'''T'''⋅'''J'''
| Time-integrated illuminance
|- 
! scope="row" | Luminous energy density
| ((math|''ω''((sub|v))))
| lumen second per cubic metre
| lm⋅s/m((sup|3))
| '''L'''((sup|−3))⋅'''T'''⋅'''J'''
| 
|- 
! scope="row" | [[Luminous efficacy]] (of radiation)
| ((math|''K''))
| lumen per [[watt]]
| lm/[[watt|W]]
| '''M'''((sup|−1))⋅'''L'''((sup|−2))⋅'''T'''((sup|3))⋅'''J'''
| Ratio of luminous flux to [[radiant flux]] 
|- 
! scope="row" | [[Luminous efficacy]] (of a source)
| ((mvar|η))((#tag:ref||group=((#if:(({3|))}|(({3))}|nb))|name=note-alternative-symbol-photometric))<!-- Examples of usage: eta seems to be in general use, rho has been seen in Slovakian WP -->
| lumen per [[watt]]
| lm/[[watt|W]]
| '''M'''((sup|−1))⋅'''L'''((sup|−2))⋅'''T'''((sup|3))⋅'''J'''
| Ratio of luminous flux to power consumption
|- 
! scope="row" | [[Luminous efficiency]], luminous coefficient
| ((mvar|V))
| 
| 
| '''1'''
| Luminous efficacy normalized by the maximum possible efficacy
|- 
| style="text-align:center;" colspan=6 | See also: ((hlist|class=inline|[[SI]]|[[Photometry (optics)|Photometry]]|[[Radiometry]]((#if:(({2|))}|((!))([[((#ifeq:(({2))}|self||Radiometry))#table-si-radiometry-units((!))Compare]])))))
|}((#if:(({3|))}||((Reflist|group=nb))))<noinclude>

((documentation))

<!-- Add cats and interwikis to the /doc subpage, not here! -->

</noinclude>

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