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The colour temperature of a source is

  • A.the temperature at which the lamp will fail in service
  • B.the ambient temperature required for correct operation
  • C.the temperature of the blackbody whose colour it matches
  • D.the actual operating temperature of the lamp envelope

Answer: C

Correct answer: the temperature of the blackbody whose colour it matches

Colour temperature is a description of appearance rather than of the lamp itself: it names the blackbody whose chromaticity the source shares. Note the inversion that catches people out - a higher colour temperature means a bluer, cooler-looking light, and a lower one a warmer, redder light.

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