a unit in which to measure light visible to the human eye. selenium cell meters, when filtered, are often used to measure footcandles. i never heard of a footcandle before i came to miner institute; i suppose they are most commonly used among scientists and engineers. here we use them all the time to measure the light levels in the cow barns.

cute story: in the early 40's, companies like general electric came out with meters that supposedly measured black light in footcandles. however, since footcandles are only a measurement of visible light, we can see this as a scientific inaccuracy put up with for the sake of convenience.

http://www.magwerks.com/Information/footcandles_vs_mW.htm really knows its footcandles...

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