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Which of the following is NOT a lighting control measure?

  • A.switching the installation in zones rather than as one
  • B.replacing magnetic ballasts with electronic ones
  • C.fitting occupancy sensors in intermittently used rooms
  • D.linking perimeter luminaires to a daylight photocell

Answer: B

Correct answer: replacing magnetic ballasts with electronic ones

A better ballast reduces the watts drawn while the lamp is on, which is an efficiency measure. Controls reduce the hours the lamp is on - zoning, occupancy sensing and daylight linking all work that way. Both save energy, but by different means, and a good scheme uses both.

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