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Group replacement of lamps before they fail is worthwhile because

  • A.lamps that have not failed can be resold
  • B.the maintenance factor may then be ignored
  • C.the installation's power consumption falls with lamp age
  • D.output has already fallen and labour is cheaper in bulk

Answer: D

By the end of life the tubes are giving well below their rated output while consuming full power, and replacing a whole bay at once costs far less per lamp than answering individual failures. Cleaning at the same visit compounds the benefit.

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