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The most important single property of a source for colour work is

  • A.the physical size of the lamp envelope
  • B.its full spectral power distribution
  • C.its correlated colour temperature alone
  • D.its luminous efficacy in lumens per watt

Answer: B

Correct answer: its full spectral power distribution

Everything else is derived from it. Correlated colour temperature reduces the spectrum to one number and cannot distinguish sources that look and render quite differently; efficacy says nothing about colour at all; and physical size affects the fixture rather than the colorimetry. Given the spectrum, every other quantity can be computed.

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