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None of the following reduces lighting energy except

  • A.removing the diffusers and leaving the lamps bare
  • B.switching alternate rows off in an over-lit area
  • C.raising the illuminance to the level of the brightest area
  • D.replacing electronic ballasts with magnetic ones

Answer: B

Where the measured level is well above the standard, switching rows off is an immediate saving at no cost. Raising the level and reverting to magnetic ballasts both increase consumption, and bare lamps cause glare and soil faster.

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