Irradiance
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Irradiance is the power of electromagnetic radiation per unit area (radiative flux) incident on a surface. Radiant emittance or radiant exitance is the power per unit area radiated by a surface. The SI units for all of these quantities are watts per square meter (W/m2), while the cgs units are ergs per square centimeter per second (erg·cm−2·s−1, often used in astronomy). These quantities are sometimes called intensity, but this usage leads to confusion with radiant intensity, which has different units.
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See also
- Radiometry
- Spectral flux density
- Photometry (optics) Main Photometry/Radiometry article—explains technical terms
- Albedo
- Illuminance
- Fluence
- Insolation
- Light diffusion
- Solar azimuth angle
- Solar irradiation
- Solar constant
- Solar noon
- Stefan-Boltzmann law
Unless indicated otherwise, the text in this article is either based on Wikipedia article "Irradiance" or another language Wikipedia page thereof used under the terms of the GNU Free Documentation License; or on research by Jahsonic and friends. See Art and Popular Culture's copyright notice.
