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Terms
  • photometer A device used to compare the luminous intensities of two sources by comparing the illuminance they produce.
  • radiometer A device used to measure the intensity of radiant energy.  
  • photometry The science of the measurement of light intensity, where "light'' refers to the total integrated range of radiation to which the eye is sensitive. It is distinguished from radiometry in which each separate wavelength in the electromagnetic...
  • electromagnetic wave Wave of radiation identified by individual fluctuations of electric and magnetic fields.
  • flux Time rate of flow of energy; the radiant or luminous power in a beam.
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