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Lamp lumen depreciation means that a lamp's output

  • A.falls only when the lamp is switched frequently
  • B.is unaffected until the lamp fails
  • C.falls progressively through its life
  • D.rises as the lamp is run in

Answer: C

A fluorescent tube may lose a fifth of its output by the end of its rated life and a diode luminaire is rated to the point where it has lost thirty per cent. Measuring the illuminance in an old installation therefore often shows it below standard.

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