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|Noun||1.||illumination unit - a measure of illumination|
light unit - a measure of the visible electromagnetic radiation
footcandle - a unit of illuminance on a surface that is everywhere 1 foot from a point source of 1 candle
lambert, L - a cgs unit of illumination equal to the brightness of a perfectly diffusing surface that emits or reflects one lumen per square centimeter
phot - a unit of illumination equal to 1 lumen per square centimeter; 10,000 phots equal 1 lux
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