What is a foot-candle, and how can I calculate
it for lighting a room? |
A foot-candle is unit
of illuminance or light falling onto a surface.
It stands for the light level on a surface
one foot from a standard candle. One foot-candle
is equal to one lumen per square foot.
To calculate the foot-candles of a lamp,
divide the lamp's lumens square footage
of the room. The lumen rating is usually
listed on the lamp package. It's a lot easier
(and probably more precise) to just take
a reading with light meter. |
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