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Three of the following are properties of a light source. Which is the odd one out?

  • A.its luminous efficacy measured in lumens per watt
  • B.the spectral reflectance of the object viewed
  • C.its correlated colour temperature
  • D.its colour rendering index

Answer: B

Reflectance belongs to the object rather than to the source. The other three are all source properties derived from its spectral power distribution. Reflectance belongs to the object instead. Source and object properties must be kept apart.

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