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The colour rendering index of a lamp describes how faithfully it

  • A.matches the colour of natural daylight
  • B.maintains its output over its life
  • C.distributes its light about the luminaire
  • D.reveals the colours of the objects it lights

Answer: D

Correct answer: reveals the colours of the objects it lights

The index compares the appearance of test colours under the lamp with their appearance under a reference source at the same colour temperature. A score of 100 means no shift at all. It is a property of the spectrum: a lamp emitting in three narrow bands can look white and still render a red badly.

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