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Correlated colour temperature is used rather than colour temperature when a source

  • A.has an entirely continuous spectral distribution
  • B.is a blackbody radiator of known temperature
  • C.does not lie exactly on the Planckian locus
  • D.lies exactly on the Planckian locus of the diagram

Answer: C

Most practical sources sit slightly off the locus and have no true colour temperature. The nearest point on the locus is used instead, measured along lines of constant perceived colour. Few real sources lie exactly on the locus.

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