7 results about "Foot-candle" patented technology

A foot-candle (sometimes foot candle; abbreviated fc, lm/ft², or sometimes ft-c) is a non-SI unit of illuminance or light intensity. One foot-candle represents "the illuminance cast on a surface by a one-candela source one foot away." This unit is commonly used in lighting layouts in parts of the world where United States customary units are used.