A foot-candle (sometimes footcandle; abbreviated fc, lm/ft², or sometimes ft-c) is a non-
SI unit of
illuminance or
light intensity widely used in
photography, film, television, and the lighting industry. The unit is defined as the amount of illumination the inside surface an imaginary 1-
foot radius
sphere would be receiving if there were a uniform point source of one
candela in the exact center of the sphere. Alternatively, it can be defined as the illuminance on a 1-
square foot surface of which there is a uniformly distributed flux of one
lumen. This can be thought of as the amount of light that actually falls on a given surface. The foot-candle is equal to one lumen per square foot.
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