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Flicker in a light source is a concern for colour assessment because it

  • A.changes the correlated colour temperature of the source
  • B.increases the ultraviolet output of the lamp substantially
  • C.raises the colour rendering index of the installation
  • D.can cause visual discomfort and affect the judgement made

Answer: D

Modulation at mains frequency or from a driver can be visible or subliminally troubling. High frequency electronic control gear is used in assessment cabinets for this reason. Modulation can be visible or subliminally troubling.

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