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A phosphor converted white LED produces white light by

  • A.mixing three separate red, green and blue emitters
  • B.heating a filament until it emits across the spectrum
  • C.an electrical discharge through low pressure mercury
  • D.a blue emitter exciting a broadband phosphor coating

Answer: D

The characteristic dip between the blue peak and the phosphor emission affects rendering. Improving the phosphor to fill that region is the main route to better rendering. The dip between peak and phosphor is characteristic.

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