Footlambert (fL, fl or ftL)
Footlambert (fL, fl or ftL) :
A unit of luminance, the brightness of a surface. The footlambert 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 footcandle. One footlambert equals 3.426 259 candelas per square meter or about 1.0764 millilambert (mLb). The unit is also spelled foot-lambert or foot lambert. The one-word spelling and symbol fL have been endorsed by the Illuminating Engineering Society of North America (IES) and by the Institute of Electrical and Electronics Engineers (IEEE). (Of course, fL is also the SI symbol for the femtoliter.)
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