Light intensity

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Several measures of light are commonly known as intensity:

  • Radiant intensity is a radiometric quantity, measured in watts per steradian (W/sr).
  • Luminous intensity is a photometric quantity, measured in lumens per steradian (lm/sr), or candela (cd).
  • Irradiance is a radiometric quantity, measured in watts per meter squared (W/m2). The equivalent quantity in other branches of physics is intensity.
  • Radiance is commonly called "intensity" in astronomy and astrophysics.

[edit] See also

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