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Which special colour rendering index value is most often quoted alongside the general index?

  • A.R1, a light greyish red
  • B.R15, a European skin tone
  • C.R8, a reddish purple
  • D.R9, a strong red

Answer: D

Strong reds are where narrow band sources most often fail badly. A high general index with a poor R9 is a recognised warning sign. Strong reds are where narrow band sources fail. A poor R9 undermines a good general score.

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