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A colour rendering index of 100 indicates that a source

  • A.has a correlated colour temperature of exactly 6500 kelvin
  • B.converts electrical power to light with no loss
  • C.renders the test samples identically to the reference
  • D.has the highest possible ultraviolet output

Answer: C

It means no shift in any of the test samples relative to the reference. A blackbody radiator scores one hundred against itself by definition. The comparison is essentially with itself. A perfect score says little about usefulness.

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