illumination unit

Noun
  1. A measure of illumination (synset 113661126)
    is a type of: light unit - a measure of the visible electromagnetic radiation
    subtypes:
    • footcandle - a unit of illuminance on a surface that is everywhere 1 foot from a point source of 1 candle
    • l, lambert - a cgs unit of illumination equal to the brightness of a perfectly diffusing surface that emits or reflects one lumen per square centimeter
    • lux, lx - a unit of illumination equal to 1 lumen per square meter; 0.0929 foot candle
    • phot - a unit of illumination equal to 1 lumen per square centimeter; 10,000 phots equal 1 lux

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