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The utilisation factor in the lumen method accounts for

  • A.the fraction of the input power converted to light
  • B.the fraction of the lamps' flux reaching the working plane
  • C.the fraction of the lamps' rated life already used
  • D.the fraction of the day the lighting is switched on

Answer: B

It depends on the luminaire's distribution, the room's proportions and the reflectances of its surfaces, and it is read from a table against the room index. Light absorbed by dark walls never reaches the task and is counted here.

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