Photo cell failure

Discussion in 'Landscape Lighting' started by Classic Lighting, Nov 12, 2012.

  1. Classic Lighting

    Classic Lighting LawnSite Senior Member
    Posts: 481

    Why is it that photo cells fail in the "on" position. I've come across 3 this month and they have all been "on".
     
  2. steveparrott

    steveparrott Sponsor
    Posts: 1,171

    The default state of a photocell is a closed circuit (lights on). When the photo receptor is energized with light, a current goes to a relay that opens the circuit (lights off).

    If the receptor window is dirty or if the sensing circuit has been damaged, then the relay is not triggered and the lights stay on.
     
  3. INTEGRA Bespoke Lighting

    INTEGRA Bespoke Lighting LawnSite Platinum Member
    Posts: 4,102

    Another question would be: Why can't anyone seem to make a quality photocell? They have been at it for long enough, you would think they would have it right by now. Horrible, unreliable things.
     

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