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The sensor it uses to turn off nad on with the sun goes down/up went bad and needs replaced.

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17y ago
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AnswerBot

7mo ago

If your Mercury vapor light won't turn off, first try turning off the switch and then turning it back on. If that doesn't work, check the photocell sensor, as it could be faulty or covered. You may also want to consult an electrician to diagnose and fix any potential wiring issues.

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16y ago

Especially if it is a CLF, compact fluorescent lamp, the ballast may still be holding some sort of a charge. The most common reason would be that the fixture has been mis-wired.

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Q: Your mercury vapor light won't turn off?
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