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Light intensities are usually measured in candle power. What that means is the equivalent of the light of one candle, measured at a distance of one foot, sometimes called, `foot candles' or `candellas'.

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In the SI system the flux or "amount" of light, is measured in lumen; and the illuminence or brightness of the light, on a surface in lumens per square metre, a compound unit called the lux.

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9y ago
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9y ago

Illumination is usually measured in foot candles, lux or lumens. Foot candles are measured one foot from the light source, whereas lumens are measured at a distance of one square meter. To convert from lumens to foot candles requires converting from square meters to square feet. Foot candles x 10.76 = number of lux.

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Q: What is unit of illumination?
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