foot-lambert
or foot·lam·bert
[ foo t-lam-bert ]
/ ˈfʊtˌlæm bərt /
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. Abbreviation: fL
Origin of foot-lambert
First recorded in 1920–25
Words nearby foot-lambert
British Dictionary definitions for foot-lambert
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
Abbreviation: ft-L