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hvac/r- pro1 11-26-2012 07:54 PM

dusk to dawn light problems
I am working on a dusk to dawn mounted street light with the sencor on the top. the light stopped working so i thought it may be the bulb. so i changed the bulb and still no light. took the bulb out and meter test reads 122.5 v . the weird thing is it has power but will not light up. another thing is i don't hear any humming or anything. so i tried the bulb on a light i know works and it fired right up. could it be a bad ground ,loose connection or bad transformer?

beenthere 11-26-2012 08:17 PM

Moved to Electrical.

user1007 11-26-2012 08:17 PM

If you are getting 122.5 v there would not be a transformer? Or is the bulb low voltage and there is a transformer between what you tested and the bulb? It sounds like your sensor might be bad and is not opening the switch.

By the way, I asked the moderators to move this to electrical. I feared it would get lost in appliances.

beenthere 11-26-2012 08:19 PM

Could be a ballast.

Is this a sodium or mercury vapor light.

k_buz 11-26-2012 08:43 PM

You will not get a meaningful reading by metering at the socket if there is a ballast in this fixture.

You need to take the fixture apart and meter the wires coming off the photocell to see if the ballast is getting power. If it is, you are either using the wrong lamp, or the ballast is bad.

HID lamps and ballasts must match.

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