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Definitions of lumen
  1. noun
    a unit of luminous flux equal to the amount of light given out through a solid angle of 1 steradian by a point source of 1 candela intensity radiating uniformly in all directions

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    lm
  2. noun
    a cavity or passage in a tubular organ
    "the lumen of the intestine"
Definition that contains lumen
  • l a cgs unit of illumination equal to the brightness of a perfectly diffusing surface that emits or reflects one lumen per square centimeter
  • 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 a unit of illumination equal to 1 lumen per square meter; 0.0929 foot candle
  • lx a unit of illumination equal to 1 lumen per square meter; 0.0929 foot candle
  • foot-lambert a former luminance unit equal to one lumen per square foot
  • phot a unit of illumination equal to 1 lumen per square centimeter; 10,000 phots equal 1 lux
  • ft-l a former luminance unit equal to one lumen per square foot
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