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Radiative Flux

(Radiative Flux Density, Radiation Flux)
(power passing through a unit area)

Radiative Flux is the amount of Electromagnetic Radiation passing through a unit area, i.e., from any direction, e.g., watts per square meter. It is conceptually the sum of the Intensity (i.e., Radiance) from all directions. The term Irradiance is the equivalent, but is used specifically regarding radiation received by a surface.