Illumination intensity, Lux unit (lx)

Luminous intensity - the density of luminous flux incident on a given surface, equal to the limit of the quotient of luminous flux Φ incident on the surface, to its area S, with S going to 0.

Luminous intensity is the only quantity of light that does not characterize the light source itself, but the brightness of the illumination of a surface.

The unit of illuminance is lux (lx) equal to lumens per square meter (cd sr m-2)

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