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illuminance

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illuminance

Quotient of the luminous flux, F, incident on an element of surface divided by the area, A, of that element of surface. Symbol: E. Thus
E = F/A
The units are in lux or footcandles. Syn. illumination. See inverse square law of illumination; photometer.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
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