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The lumen method computes the number of luminaires from the required illuminance, the area and

  • A.the lamp wattage and the tariff
  • B.the room's reflectances alone
  • C.the colour rendering index of the lamp
  • D.the flux per luminaire together with the utilisation and maintenance factors

Answer: D

Total flux required is the illuminance times the area divided by the product of the two factors, and dividing by the flux per luminaire gives the count. It is a design method rather than an audit measurement, but an auditor uses it to judge whether an installation is right.

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