Radiant flux

Radiant flux

In radiometry, radiant flux or radiant power is the measure of the total power of electromagnetic radiation (including infrared, ultraviolet, and visible light). The power may be the total emitted from a source, or the total landing on a particular surface.


The SI unit of radiant flux is the watt (W), which has dimensions of energy/time or, in SI units joules/second.

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