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Illuminant D65 represents

  • A.the light from a tungsten lamp at 6500 kelvin
  • B.a theoretical equal energy spectrum across the visible
  • C.average daylight including an ultraviolet component
  • D.direct midday sunlight with no sky component present

Answer: C

Correct answer: average daylight including an ultraviolet component

D65 represents an average phase of daylight, sky included rather than direct sun alone, and it carries ultraviolet. That last point matters practically: fluorescent whitening agents are excited by ultraviolet, so a simulator deficient in it will make a brightened sample look quite different from how it looks outdoors.

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