Template:SI light units
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Quantity | Symbol | SI unit | Abbr. | Notes | ||||
---|---|---|---|---|---|---|---|---|
Luminous energy | Qv | lumen second | lm·s | units are sometimes called talbots | ||||
Luminous flux | F | lumen (= cd·sr) | lm | also called luminous power | ||||
Luminous intensity | Iv | candela (= lm/sr) | cd | an SI base unit | ||||
Luminance | Lv | candela per square metre | cd/m2 | units are sometimes called nits | ||||
Illuminance | Ev | lux (= lm/m2) | lx | Used for light incident on a surface | ||||
Luminous emittance | Mv | lux (= lm/m2) | lx | Used for light emitted from a surface | ||||
Luminous efficacy | lumen per watt | lm/W | ratio of luminous flux to radiant flux; maximum possible is 683.002 lm/W | |||||
SI • Photometry |