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A lux meter must be held

  • A.at the ceiling, close to the luminaire
  • B.against the wall of the room being measured
  • C.at eye level facing the nearest window
  • D.at the working plane, with the sensor cosine corrected

Answer: D

The quantity that matters is the illumination on the surface where the work is done, and the sensor must weight light arriving obliquely as the surface does. Measuring near the lamp reports its output rather than the useful result.

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