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Lumen   /lˈumən/   Listen
Lumen

noun
(pl. L. lumina, E. lumens)
1.
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.  Synonym: lm.
2.
A cavity or passage in a tubular organ.





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"Lumen" Quotes from Famous Books



... of light has a luminous intensity of one candle in all directions, the illumination at a distance of one foot in any direction is said to be a foot-candle. This is the unit of illumination intensity. A lumen is the quantity of light which falls on one square foot if the intensity of illumination is one foot-candle. It is seen that the area of a sphere with a radius of one foot is 4 pi or 12.57 square feet; therefore, a light-source having ...
— Artificial Light - Its Influence upon Civilization • M. Luckiesh


Words linked to "Lumen" :   luminous flux unit, cavity, cavum, bodily cavity, lm


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