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The quantity that a lighting standard for an office actually specifies is

  • A.the luminous flux of each lamp fitted
  • B.the total installed wattage per square metre
  • C.the luminance of the ceiling
  • D.the illuminance at the working plane

Answer: D

What matters is the light on the desk, and the standard sets it in lux together with a uniformity and a glare limit. Installed wattage per square metre is a separate efficiency benchmark rather than a lighting requirement.

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