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Triphosphor fluorescent lamps improve on halophosphate lamps by

  • A.producing a perfectly smooth continuous spectral distribution
  • B.removing the mercury from the discharge entirely
  • C.operating at a much higher physical temperature
  • D.placing narrow emission bands where the eye is most sensitive

Answer: D

Efficacy improves considerably because light is placed where it is most useful. Rendering of saturated colours can suffer, since the spectrum has deep gaps between the bands. Efficacy is bought at the cost of the gaps.

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