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An indoor illuminance of 300 lux under an outdoor illuminance of 15 000 lux gives a daylight factor of

  • A.20 per cent
  • B.0.2 per cent
  • C.5 per cent
  • D.2 per cent

Answer: D

Three hundred divided by fifteen thousand is 0.02, that is two per cent, which is a reasonable figure for a side-lit room away from the window. Five per cent or more would be a well daylit space needing no electric light in the day.

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