Lm vs. Lumen — What's the Difference?

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

The SI unit of luminous flux, equal to the amount of light emitted per second in a unit solid angle of one steradian from a uniform source of one candela.

The central cavity of a tubular or other hollow structure in an organism or cell

(Anatomy) The inner open space or cavity of a tubular organ, as of a blood vessel or an intestine.

(Biology) The interior of a membrane-bound compartment or organelle in a cell.

Abbr. lm(Physics) The SI unit of luminous flux, equal to the amount of light per unit time passing through a solid angle of one steradian from a light source of one candela intensity radiating equally in all directions. See Table at measurement.

(physics) In the International System of Units, the derived unit of luminous flux; the light that is emitted in a solid angle of one steradian from a source of one candela. Symbol: lm.

(anatomy) The cavity or channel within a tube or tubular organ.

(botany) The cavity bounded by a plant cell wall.

(medicine) The bore of a tube such as a hollow needle or catheter.

A unit of illumination, being the amount of illumination of a unit area of spherical surface, due to a light of unit intensity placed at the center of the sphere.

An opening, space, or cavity, esp. a tubular cavity; a vacuole.

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

A cavity or passage in a tubular organ;