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Radiant flux
From Wikipedia, the free encyclopedia
(Redirected from Radiant power)
In radiometry, radiant flux or radiant power is the measure of the total power of electromagnetic radiation (including 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.
[edit]
| Quantity | Symbol | SI unit | Abbr. | Notes |
|---|---|---|---|---|
| Radiant energy | Q | joule | J | energy |
| Radiant flux | Φ | watt | W | radiant energy per unit time, also called radiant power |
| Radiant intensity | I | watt per steradian | W·sr−1 | power per unit solid angle |
| Radiance | L | watt per steradian per square metre | W·sr−1·m−2 | power per unit solid angle per unit projected source area. Sometimes confusingly called "intensity". |
| Irradiance | E | watt per square metre | W·m−2 | power incident on a surface. Sometimes confusingly called "intensity". |
| Radiant exitance / Radiant emittance | M | watt per square metre | W·m−2 | power emitted from a surface. |
| Radiosity | J or Jλ | watt per square metre | W·m−2 | emitted plus reflected power leaving a surface |
| Spectral radiance | Lλ or Lν |
watt per steradian per metre3 or watt per steradian per square metre per hertz |
W·sr−1·m−3 or W·sr−1·m−2·Hz−1 |
commonly measured in W·sr−1·m−2·nm−1 |
| Spectral irradiance | Eλ or Eν |
watt per metre3 or watt per square metre per hertz |
W·m−3 or W·m−2·Hz−1 |
commonly measured in W·m−2·nm−1 |
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