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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 meter squared (W/m2)
- Intensity (physics), the name for irradiance used in other branches of physics (W/m2)
- Radiance, commonly called "intensity" in astronomy and astrophysics (W·sr−1·m−2)
- Brightness, the subjective perception elicited by the luminance of a source
- Luminance, the photometric equivalent of radiance (lm·sr−1·m−2)
- Photometry (optics), measurement of light, in terms of its perceived brightness to the human eye
- Radiometry, measurement of light, in absolute power units
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