Alternate Definitions for Radiance

A radiometric measurement that describes theamount of electromagnetic radiation that passes through or is emitted from aparticular area, and falls within a given solid angle in a specifieddirection. They are used to characterize both emission from diffuse sourcesand reflection from diffuse surfaces.

A radiometric measurement that describes the amount of
electromagnetic radiation that passes through or is
emitted from a particular area, and falls within a given
solid angle in a specified direction. They are used to
characterize both emission from diffuse sources and
reflection from diffuse surfaces. The SI unit of radiance
is watts per steradian per square meter (Wsr^-1*m^-2).