Besaran cahaya

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SI radiometry units
Quantity
Symbol
SI unit
Abbr.
Notes
Radiant energy Q joule J energy
Radiant flux watt W radiant energy per unit time, also called radiant power
Radiant intensity I watt/steradian W.sr-1 power per unit solid angle
Radiance L watt/steradian/square meter W.sr-1.m-2 power per unit solid angle per unit projected source area called intensity in some other fields of study
Irradiance E, I watt/square meter W.m-2 power incident on a surface, sometimes confusingly called intensity
Radiant exitance / Radiant emittance M watt/square meter W.m-2 power emitted from a surface
Radiosity J or J\lambda watt/square meter W.m-2 emitted plus reflected power leaving a surface
Spectral radiance L\lambda
or
Lv
watt/steradian/meter3
or
watt/steradian/square meter/hertz
W.sr-1.m.-3
or
W.sr-1.m-2.Hz-1
commonly measured in W.sr-1.m-2.nm-1
Spectral irradiance E\lambda
or
Ev
watt/meter3
or
watt/square meter/hertz
W.m-3
or
W.m-2.Hz-1
commonly measured in W.m-2.nm-1
SI photometry units
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 (=lumen/sr) cd an SI base unit
Luminance Lv candela/square meter 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 on a surface
Luminous efficacy lumen/watt lm/W ratio of luminouos flux to radiant flux

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