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Luminous Intensity, Illuminance, and Lux Explained

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Talia Carbis

Luminous intensity is measured in candela and describes the concentration of light emitted from a source in a particular direction. The illuminance on a surface is measured in lux and describes the amount of light falling on an area, calculated by taking the luminous flux in lumens emitted from a source and dividing by the area in square meters. Lux is the standard unit used to quantify how much luminous flux is spread over a given area when light arrives from a source.

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Luminous intensity
 
E = F A = Lumens Area = Lux (Lumens per m 2 )
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Luminous Intensity, Illuminance, and Lux Explained