foot-lambert(redirected from Foot lambert)
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n. Abbr. fL
A unit of luminance equal to 1/π candela per square foot.
(Units) 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. Abbreviation: ft-L
a unit of luminance equal to the luminance of a surface emitting a luminous flux of one lumen per square foot.