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nouna 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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"the lumen of the intestine"nouna cavity or passage in a tubular organtype of:
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
- 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
- foot-lambert a former luminance unit equal to one lumen per square foot