Pronunciation: (foot'lam"burt), [key]
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. Abbr.: fL Also,foot'lam"bert.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.