View source for Template:SI light units

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|- 
! colspan="2"| Quantity
! colspan="2"| Unit<!-- &nbsp;(SI) -->
! [[Dimensional analysis#Definition|Dimension]]
! rowspan="2"| Notes
|- 
! <small>Name</small>
! <small>Symbol</small>{{#tag:ref|[[Engineering:Standards organization|Standards organization]]s recommend that photometric quantities be denoted with a subscript "v" (for "visual") to avoid confusion with radiometric or [[Physics:Photon|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}}
! <small>Name</small>
! <small>Symbol</small>
! <small>Symbol</small>{{#tag:ref|The symbols in this column denote [[Dimension of a physical quantity|dimension]]s; "'''L'''", "'''T'''" and "'''J'''" are for length, time and luminous intensity respectively, not the symbols for the [[Units of measurement|unit]]s 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]] -->
|- 
| [[Physics:Luminous energy|Luminous energy]]
| ''Q''<sub>v</sub>{{#tag:ref|Alternative symbols sometimes seen: ''W'' for luminous energy, ''P'' or ''F'' for luminous flux, and ''&rho;'' 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 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''.
|- 
| [[Physics:Luminous flux|Luminous flux]], luminous power
| ''Φ''<sub>[[Physics:Luminosity function|v]]</sub>{{#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]] (= candela steradians)
| lm (=&nbsp;cd⋅[[Steradian|sr]])
| '''J'''<!-- STOP! J does not stand for Joules here! This column is dimensions, not units!-->
| Luminous energy per unit time
|- 
| [[Physics:Luminous intensity|Luminous intensity]]
| ''I''<sub>v</sub>
| [[Candela|candela]] (= 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 [[Physics:Solid angle|solid angle]]
|- 
| [[Physics:Luminance|Luminance]]
| ''L''<sub>v</sub>
| [[Candela per square metre|candela per square metre]]
| cd/m<sup>2</sup>
| '''L'''<sup>−2</sup>⋅'''J'''
| Luminous flux per unit solid angle per unit ''projected'' source area. The candela per square metre is sometimes called the ''[[Nit (unit)|nit]]''.
|- 
| [[Physics:Illuminance|Illuminance]]
| ''E''<sub>v</sub>
| [[Lux|lux]] (= lumen per square metre)
| [[Lux|lx]] (=&nbsp;lm/m<sup>2</sup>)
| '''L'''<sup>−2</sup>⋅'''J'''
| Luminous flux ''incident'' on a surface
|-
| [[Luminous exitance]], luminous emittance
| ''M''<sub>v</sub>
| lux
| lx
| '''L'''<sup>−2</sup>⋅'''J'''
| Luminous flux ''emitted'' from a surface
|- 
| [[Physics:Luminous exposure|Luminous exposure]]
| ''H''<sub>v</sub>
| [[Lux second|lux second]]
| lx⋅s
| '''L'''<sup>−2</sup>⋅'''T'''⋅'''J'''
| Time-integrated illuminance
|- 
| Luminous energy density
| ''ω''<sub>v</sub>
| lumen second per cubic metre
| lm⋅s/m<sup>3</sup>
| '''L'''<sup>−3</sup>⋅'''T'''⋅'''J'''
| 
|- 
| [[Physics:Luminous efficacy|Luminous efficacy]] (of radiation)
| ''K''
| lumen per [[Watt|watt]]
| lm/[[Watt|W]]
| '''M'''<sup>−1</sup>⋅'''L'''<sup>−2</sup>⋅'''T'''<sup>3</sup>⋅'''J'''
| Ratio of luminous flux to [[Physics:Radiant flux|radiant flux]] 
|- 
| [[Physics:Luminous efficacy|Luminous efficacy]] (of a source)
| ''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|watt]]
| lm/[[Watt|W]]
| '''M'''<sup>−1</sup>⋅'''L'''<sup>−2</sup>⋅'''T'''<sup>3</sup>⋅'''J'''
| Ratio of luminous flux to power consumption
|- 
| [[Luminous efficiency]], luminous coefficient
| ''V''
| 
| 
| '''1'''
| Luminous efficacy normalized by the maximum possible efficacy
|- 
| style="text-align:center;" colspan=9 | See also: [[SI]]{{&middot;}} [[Physics:Photometry (optics)|Photometry]]{{&middot;}} [[Astronomy:Radiometry|Radiometry]]{{#if:{{{2|}}}|{{&middot;}} ([[{{#ifeq:{{{2}}}|self||Radiometry}}#table-si-radiometry-units{{!}}Compare]])}}
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