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Is the light on a photocell that turns it on at dark and back off at daylight?Thank you again for trusting us with your problem.
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The problem can be a bad sensor, a ballast or a bad bulb. If you have not noticed the light getting dimmer than when it was working I imagine the bulb will need to be replaced. Often the entire fixture can be purchased cheaper replacing the ballast. I have seen these lights on sale for as cheap as $29 when the lamp alone cost almost $20. If the light never got dim the ballast or the control would be the problem. Here again the replacement would be close to what the part would cost. I would suggest that you replace the fixture instead of trying to fix it or have it repaired.
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Edward is correct and you shouldd accept HIS answer ..
I have just one thought please .. before you spend money on a new fixture .. which is probably the solution .. just hate for it to be something easy ..
If this is a definite consistant time interval that it cycles thru ..
check the area around the light to see if there is anything that could be reflecting the light so that it is being senced by the photo cell and turnig itself off ...
good luck .. Rich