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Choosing an assessment illuminant should be governed principally by

  • A.whichever illuminant shows the smallest colour difference of all
  • B.the preference of whichever observer is on duty that day
  • C.the lighting under which the product will actually be used
  • D.the lamp that happens to be available in the laboratory

Answer: C

Correct answer: the lighting under which the product will actually be used

A match exists under a stated illuminant, so the illuminant chosen should be the one the product will be seen under - daylight for an exterior finish, store lighting for goods on a shelf, and often both. Convenience, availability and observer preference are not reasons, and choosing the flattering illuminant is worse than any of them.

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