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illuminance
(redirected from illuminances)

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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.
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Measurement day and the outdoor diffuse and global horizontal illuminances and irradiances at each time step (five minutes).
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The increase was only nominal, however, for sites with illuminances above three foot-candles.
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