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Luminance, Foot-lambert

A foot-lambert or footlambert (fL, sometimes fl) is a unit of measurement of luminance in U.S. customary units. A footlambert equals 1 / π candela per square foot, or 3.4262591 candelas per square meter (nits). The luminance of a perfect lambertian diffuse reflecting surface in footlamberts is equal to the incident illuminance in foot-candles. For real diffuse reflectors, the ratio of luminance to illuminance in these units is roughly equal to the reflectance of the surface. Read more >>
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Luminance is a photometric measure of the density of luminous intensity in a given direction. It describes the amount of light that passes through or is emitted from a particular area, and falls within a given solid angle. The SI unit for luminance is candela per square metre (cd/m2). The CGS unit of luminance is the stilb, which is equal to one candela per square centimetre or 10 kcd/m2. Read more >>
 
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