500 candelas at 1 foot distance
23.33333_ lux
A foot candle refers to the the amount of light a light bulb, sun.. etc puts out.
The footcandle is a measure of the amount of light in a space. For classrooms the amount of light at desk height should be about 50 footcandles. Parking garages reguire about 5 foot candles. 1...
One footcandle is equal to 10.746 lux.