The derived SI unit of luminous flux, defined as the luminous flux emitted by a uniform point source of 1 candela [cd] emitting its luminous energy over a solid angle of 1 steradian [sr]; it thus has units of cd sr. The lumen is often abbreviated to lm.

See also: Brightness, Illuminance, lumen hour.

Previous PageView links to and from this pageNext Page

Subjects: Optics Physics