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foot-lambert
or foot·lam·bert
[ foot-lam-bert ]
noun
, Optics.
- a unit of luminance or photometric brightness, equal to the luminance of a surface emitting a luminous flux of one lumen per square foot, the luminance of a perfectly reflecting surface receiving an illumination of one foot-candle. : fL
foot-lambert
noun
- a former unit of luminance equal to the luminance of a surface emitting or reflecting 1 lumen per square foot. A completely reflecting surface illuminated by 1 foot-candle has a luminance of 1 foot-lambert ft-L
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Word History and Origins
Origin of foot-lambert1
First recorded in 1920–25
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