quantitykind:LuminousFluxPerArea

Type
Description

In photometry, illuminance is the total luminous flux incident on a surface, per unit area. It is a measure of how much the incident light illuminates the surface, wavelength-weighted by the luminosity function to correlate with human brightness perception. Similarly, luminous emittance is the luminous flux per unit area emitted from a surface. In SI derived units these are measured in $$lux (lx)$$ or $$lumens per square metre$$ ($$cd \cdot m^{-2}$$). In the CGS system, the unit of illuminance is the $$phot$$, which is equal to $$10,000 lux$$. The $$foot-candle$$ is a non-metric unit of illuminance that is used in photography.

Properties
$$J \cdot U/L^2$$
$$cd/m^2$$
Annotations
In photometry, illuminance is the total luminous flux incident on a surface, per unit area. It is a measure of how much the incident light illuminates the surface, wavelength-weighted by the luminosity function to correlate with human brightness perception. Similarly, luminous emittance is the luminous flux per unit area emitted from a surface. In SI derived units these are measured in $$lux (lx)$$ or $$lumens per square metre$$ ($$cd \cdot m^{-2}$$). In the CGS system, the unit of illuminance is the $$phot$$, which is equal to $$10,000 lux$$. The $$foot-candle$$ is a non-metric unit of illuminance that is used in photography.
Luminous Flux per Area(en)

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