The result of luminous flux striking a surface. In English units, one lumen of flux falling on one square foot of area
is defined as an illumination of one foot-candle. In the metric system, one lumen illuminating one square meter
is the definition of one lux. This gives a direct conversion factor of 10.76 lux = 1 foot-candle.that have a collective
efficiency of 99.97 percent for a 0.3-micrometre particle size.
Illuminance (Or Illumination)
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