Also known as: fl.
FL has various meanings in the Military category. Discover the full forms, definitions, and usage contexts of FL in Military.
A unit of luminance (photometric brightness). The foot-lambert describes the luminance of a surface that emits or reflects one lumen per square foot; it is the luminance of a perfectly reflecting surface under an illumination of one foot-candle. One foot-lambert equals 0.3183 candles per square foot.
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