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Daylight-linked dimming saves energy by

  • A.raising the illuminance to match the outdoor level
  • B.delaying the switch-on until a fixed hour
  • C.reducing the electric light as the daylight rises
  • D.switching the lighting off entirely when the sun is out

Answer: C

A photocell measures the working plane and trims the luminaires so the total stays at the design level, so the perimeter of a daylit building may need very little electric light for much of the day. Abrupt switching is disliked by occupants, which is why dimming is preferred.

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