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n. - A cavity or passage in a tubular organ; 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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Usage examples (22)
  • The lumen of the intestine
  • Latin vocabulary of that time this external agent was designated by the term lumen while lux was used to indicate its mental representation.
  • They must be sealed to avoid moisture and kept clean to maintain lumen maintenance.
  • Lifetime typically refers to the useful time of light output, also referred to as lumen maintenance.
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