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    Kyle_in_rure's Avatar
    Kyle_in_rure Posts: 341, Reputation: 10
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    #1

    Dec 27, 2011, 09:04 PM
    Mercury vapor fixture problem
    I have a 175 watt mercury vapor fixture illuminating my driveway. Something happened a few months ago and now it stays on 24/7. I've changed the photocell but the problem persists. It actually went off once during the day but only that one time. I don't think it's a ballast problem, because it stays on. I'm about to install a new fixture, but before I do, is there anything else I should check? Should I try changing the bulb? Since they're not made any more, I would hate to throw it out if it's fixable. Thanks
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #2

    Dec 28, 2011, 04:10 AM
    Does it work without the PC? The feed is a black to the PC and the switch leg is the red to the ballast, simply trace it out and see if there is a short that the ballast is getting power somehow.
    Kyle_in_rure's Avatar
    Kyle_in_rure Posts: 341, Reputation: 10
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    #3

    Dec 28, 2011, 10:02 AM
    When the photocell is removed, the light does not work. I'm going to have to take it down to get a good look at it.
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #4

    Dec 29, 2011, 02:57 AM
    Then sounds like a defective photocell is the problem.
    Kyle_in_rure's Avatar
    Kyle_in_rure Posts: 341, Reputation: 10
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    #5

    Dec 29, 2011, 07:18 PM
    The photocell was actually replaced twice, with two different kinds. Once I take it down maybe I will be able to figure it out.
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