1. : the cavity of a tubular organ or part. the lumen of a blood vessel. 2. : the bore of a tube (as of a hollow needle or catheter) 3. : a unit of luminous flux equal to the light emitted in a unit solid …

lumen 1. Anatomy The inner open space or cavity of a tubular organ, as of a blood vessel or an intestine. 2. Biology The interior of a membrane-bound compartment or organelle in a cell. 3. Abbr. lmPhysics The SI unit of luminous flux, equal to the amount of light per unit time passing through a ...

The lumen is the unit of luminous flux, a measure of the total quantity of visible light emitted by a source per unit of time, in the International System of Units. Luminous flux differs from power in that radiant flux includes all electromagnetic waves emitted, while luminous flux is weighted according to a model of the human eye's sensitivity to various wavelengths. One lux is one …

The lumen (symbolized lm) is the International Unit of luminous flux. It is defined in terms of candela steradian s (cd multiplied by sr). One lumen is the amount of light emitted in a solid angle of 1 sr, from a source that radiates to an equal extent in all directions, and whose intensity is 1 cd.

the derived SI unit of luminous flux; the flux emitted in a solid angle of 1 steradian by a point source having a uniform intensity of 1 candelaSymbol: lm. anatomy a passage, duct, or cavity in a tubular organ. a cavity within a plant cell enclosed by the cell walls.

lumen ( ˈluːmɪn) n, pl -mens or -mina ( -mɪnə) 1. (Units) the derived SI unit of luminous flux; the flux emitted in a solid angle of 1 steradian by a point source having a uniform intensity of 1 candela. Symbol: lm 2. (Anatomy) anatomy a passage, duct, or cavity in a tubular organ 3. (Botany) a cavity within a plant cell enclosed by the cell walls

Lumen definition is: “a unit of luminous flux in the International System of Units (SI), that is equal to the amount of light given out through a solid angle by a source of one candela intensity radiating equally in all directions.” Luminous Flux is how much visible light is emitted by a light source or received by a surface.

Definitions of lumen noun a cavity or passage in a tubular organ “the lumen of the intestine” see more noun a unit of luminous flux equal to the amount of light given out through a solid angle …

Definition Of Lumen, A Factor Of Brightness In A Lamp The lamp is a means of lighting at night. Because if there is no light, the world will feel dark even though the moon is present as natural light. Did you know that the brightness of a lamp does not only come from watts? But there is another factor, namely the lumen.

26/01/2022 · The definition of lumen is: “a unit of luminous flux in the International System of Units, that is equal to the amount of light given out through a solid angle by a source of one candela intensity radiating equally in all directions.”. In short, lumens equal brightness. And watts do not.