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Light intensity

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Several measures of light are commonly known as intensity:

Radiant intensity, a radiometric quantity measured in watts per steradian (W/sr)
Luminous intensity, a photometric quantity measured in lumens per steradian (lm/sr), or candela (cd)
Irradiance, a radiometric quantity, measured in watts per square meter (W/m)
- Intensity (physics), the name for irradiance used in other branches of physics (W/m)
Radiance, commonly called "intensity" in astronomy and astrophysics (W·sr·m)

See also

Brightness, the subjective perception elicited by the luminance of a source
Luminance, the photometric equivalent of radiance (lm·sr·m)
Photometry (optics), measurement of light, in terms of its perceived brightness to the human eye
Radiometry, measurement of light, in absolute power units
Luminosity

Topics referred to by the same term

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