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Footcandle Light Guide

What does footcandle mean?

The term footcandle is defined as the amount of illumination the interior surface of a one-foot-radius sphere would be receiving if there were a uniform point source of one candela in the exact center of the sphere. It can also be defined as the illuminance of a one-square foot surface of which there is a uniformly distributed flux of one lumen. Footcandles are used to calculate the light levels of commercial lighting spaces such as warehouses, gymnasiums, offices, work spaces, retail stores, buildings and parking lots.