Lux is the SI unit of

Physics
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Lux is the SI unit of

Jan 9th, 2015

Lux, SI unit of illuminance, symbol lx. Illuminance is the luminous flux (radiant energy per second in the visible part of the spectrum, measured in lumens) per unit area falling on a surface. For a point source of luminous intensity I at a distance d from a surface that is turned away from the source by an angle θ, the illuminance is given by Icos θ /d 2. 

Jan 9th, 2015

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