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The maintenance factor in a lighting design allows for

  • A.the variation of the supply voltage over the day
  • B.lamp lumen depreciation and dirt on the luminaire and room surfaces
  • C.the loss in the ballast over the lamp's life
  • D.the cost of replacing lamps as they fail

Answer: B

A design that ignored it would fall below the required illuminance within a year or two, so the installation is designed to exceed the standard when new. Cleaning and timely replacement are what keep the assumed factor honest.

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