Amounts of visible light can be measured in units of Lux or Foot-candles. Lux is a metric measurement while Foot-Candle is the empirical counterpart.
Lux. The Lux is a unit of illumination or how bright something is. The Lux is defined as the illumination on the surface on a sphere of radius one metre due to a uniform point source of one candle (heated carbon filament) placed at its centre.
Foot-Candle. The Foot-candle is defined as the illumination on the surface on a sphere of radius one-foot due to a uniform point source of one candle placed at its centre.
Saturday, December 24, 2011
VISIBLE LIGHT
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