Foot-lambert
[foo t-lam-bert] /ˈfʊtˌlæm bərt/
noun, Optics.
1.
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.
Abbreviation: fL.
noun
1.
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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