footcandle

Convert between footcandles and other major units of illuminance.

A unit of illuminance in the foot-pound-second system of units, the illuminance at 1 foot from a 1-candela point source of light. Symbol, Ftc. One footcandle is approximately 10.76391 lux.

Originally the footcandle was the illuminance at 1 foot from a standard candle, then at 1 foot from an international candle. It was next defined as the illuminance produced by 1 lumen of “luminous flux” evenly distributed over a square foot.

Though not an SI unit, footcandles are still widely used to set lighting levels in architecture, in stage lighting, and in photography.

Sorry. No information on contributors is available for this page.

home | units index | search |  contact drawing of envelope |  contributors | 
help | privacy | terms of use