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foot-candle
or foot·can·dle
[ foot-kan-dl ]
noun
, Optics.
- a unit of illuminance or illumination, equivalent to the illumination produced by a source of one candle at a distance of one foot and equal to one lumen incident per square foot. : FC
foot-candle
noun
- a former unit of illumination, equal to one lumen per square foot or 10.764 lux
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Word History and Origins
Origin of foot-candle1
First recorded in 1905–10
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Example Sentences
A lumen is the quantity of light which falls on one square foot if the intensity of illumination is one foot-candle.
From Project Gutenberg
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