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A light source differs from an illuminant in that a source is

  • A.a physical object emitting light, while an illuminant is a specification
  • B.a specification of relative power, while an illuminant is an actual lamp
  • C.used only for measurement, while an illuminant is used for viewing
  • D.always monochromatic, while an illuminant is always broadband

Answer: A

An illuminant is a table of relative spectral power that need not be realisable. Illuminant D65 is defined numerically, whereas a daylight simulator lamp is an attempt to realise it. One is a table of numbers and the other a lamp.

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