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A source metamerism index differs from a sample metamerism index in that the source index measures

  • A.how well a lamp matches a defined reference illuminant
  • B.how badly two samples match under a change of illuminant
  • C.the ultraviolet output of the source being assessed
  • D.the efficacy of the lamp in lumens per watt consumed

Answer: A

One assesses the lamp and the other assesses the pair of samples. Confusing the two leads to blaming the lamp for a sample problem or the reverse. One grades the lamp and one the samples. Confusing them misdirects the investigation entirely.

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