Light intensity(analogous to sound amplitude)

• Radiant flux Photons/s

• Irradiance Photons/sïm2

  • Total light, including scattered and direct

• Radiant intensity Photons/sïsr

• Radiance Photons/sïsrïm2

  • Only direct light emitted from a specific area
  • sr = steradian with 4p steradians in a sphere
  • Note that intensity is independent of wavelength
  • But wavelength is inversely related to energy

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