radiantenergy
Radiant energy is the energy carried by electromagnetic radiation as it travels through space or a medium. It includes energy from visible light as well as other wavelengths such as infrared and ultraviolet. The energy of a single photon is E = hν, where h is Planck's constant and ν is the frequency. For a stream of photons or any radiative flux, the total radiant energy transferred over a time interval is the integral of radiant power P with respect to time: E = ∫ P dt. The instantaneous radiant power, measured in watts, is the rate at which energy crosses a surface.
Radiant energy is a central concept in radiometry and photonics. Radiant flux density (Watts per square meter)
In applications, radiant energy underpins solar energy, thermal radiation, infrared heating, and the operation of photosensitive