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...
A foot candle refers to the the amount of light a light bulb, sun.. etc puts out.
feet,duh Although you could use inches or centimeters or even smaller units to be more exact.
You use the ball of your foot.
human beings