foot-lambert









foot-lambert


foot-lambert or foot·lam·bert [foo t-lam-bert] Word Origin 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

Origin of foot-lambert First recorded in 1920–25 British Dictionary definitions for foot-lambert foot-lambert 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-lambertAbbreviation: ft-L
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