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.

Units

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

See also

• Luminous flux
• Power (physics)
• Radiosity (heat transfer)