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The lumen is the unit of

  • A.luminous flux
  • B.illuminance on a surface
  • C.luminous intensity in a direction
  • D.luminance of a surface

Answer: A

Correct answer: luminous flux

The lumen measures the total light a source emits, weighted by the eye’s sensitivity across the spectrum. Illuminance is measured in lux, which is lumens per square metre; intensity in candelas; and luminance in candelas per square metre. Keeping the four apart is the beginning of lighting calculation.

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