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A light emitting diode luminaire's driver serves to

  • A.supply the diodes with a controlled current
  • B.raise the supply voltage to the diodes' rating
  • C.convert the direct current output to alternating
  • D.dissipate the heat the diodes generate

Answer: A

Diode output depends steeply on current, so a constant-current supply is what keeps the light output and the life predictable. Its efficiency and its own life are frequently what limit the luminaire rather than the diodes themselves.

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