Light intensity

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• Radiant intensity
  Radiant intensity
  
  In radiometry, radiant intensity is a measure of the intensity of electromagnetic radiation. It is defined as power per unit solid angle. The SI unit of radiant intensity is watts per steradian ....
  , a radiometric quantity measured in watts per steradian (W/sr)
• Luminous intensity
  Luminous intensity
  
  In Photometry , luminous intensity is a measure of the wavelength-weighted Power emitted by a light source in a particular direction per unit solid angle, based on the luminosity function, a standardized model of the sensitivity of the human eye....
  , a photometric quantity measured in lumens per steradian (lm/sr), or candela (cd)
• Irradiance
  Irradiance
  
  Irradiance, radiant emittance, and radiant exitance are radiometry terms for the power of electromagnetic radiation at a surface, per unit area....
  , a radiometric quantity, measured in watts per meter squared (W/m²)
• Intensity (physics)
  Intensity (physics)
  
  In physics, intensity is a Measurement of the time averaging energy flux. The word "intensity" here is not synonymous with "wikt:strength", "wikt:amplitude", or "wikt:level", as it sometimes is in colloquial speech....
  , the name for irradiance used in other branches of physics (W/m²)
• Radiance
  Radiance
  
  Radiance and spectral radiance are radiometry measures that describe the amount of light that passes through or is emitted from a particular area, and falls within a given solid angle in a specified direction....
  , commonly called "intensity" in astronomy and astrophysics (W·sr^-1·m^-2)

See also

• Brightness
  Brightness
  
  Brightness is an attribute of visual perception in which a source appears to be radiating or reflecting light. In other words, brightness is the perception elicited by the luminance of a visual target....
  , the subjective perception elicited by the luminance of a source
• Luminance
  Luminance
  
  Luminance is a Photometry measure of the luminous intensity per unit area of light travelling in a given direction. It describes the amount of light that passes through or is emitted from a particular area, and falls within a given solid angle....
  , the photometric equivalent of radiance (lm·sr^-1·m^-2)