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A known weakness of the general colour rendering index is that it

  • A.varies with whichever observer happens to be judging
  • B.uses only pastel test samples and averages the results
  • C.cannot be calculated for any fluorescent lamp at all
  • D.requires the source to lie exactly on the Planckian locus

Answer: B

Averaging over eight unsaturated samples can conceal a severe shift in a saturated one. Narrow band sources are flattered by the method more than they deserve. Eight pastel samples reveal too little. Saturated colours expose what averaging conceals.

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