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Old 09-10-2009, 11:59 AM   #1
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Light bulbs blowing,,,


I have two recessed 25w spot lights above the fireplace. The last light in the run suddenly started burning up bulbs - in seconds. I noticed that the bulb was out, so I replaced it. The light got real bright for a few seconds then went out. I thought it might be a defective bulb, so I removed it and screwed in another. It did the same thing! It's a standard 110v 15A SP light circuit. The other light on the line is fine. I pulled the light out of the can and put a meter into the socket and it read normal. Does any one know what may be causing this? Could there have been a short or something that may have caused the lights to blow, which might have cleared up when I pulled the light out of the can?

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Old 09-10-2009, 07:58 PM   #2
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Light bulbs blowing,,,


Try it with a light bulb rated at 130 volts, and then post back.

Also who wire the lights above the fireplace, you?

And the bulbs, are they normal, flood or spots, that screw into a lamp socket?


Last edited by Ranger31; 09-10-2009 at 08:01 PM.
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Old 09-10-2009, 08:44 PM   #3
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Light bulbs blowing,,,


Carefully get a volt meter and test the socket. This will be a tricky process, be very carefull to not have a single probe touch the inside metal and the socket itself. Test one that works and see if the voltage is different. Weird it's only doing it on one socket though.
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Old 09-10-2009, 09:35 PM   #4
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Light bulbs blowing,,,


I use a med household adapter. Made by Eagle.

This adapter screw in to medium (household) socket and converts it
to a standard 2-outlet plug receptacle. Then you can stick you meter
test probes safely into the receptacle two individual blade slots.
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Old 09-11-2009, 09:13 AM   #5
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Light bulbs blowing,,,


woodcutter; what was the voltage you read with your volt meter?

Are the lamps bin pin or edison base?

Are we talking about light fixture that use low voltage lamps, (bi-pin)
or line voltage, (edison base)?
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Old 09-11-2009, 11:36 AM   #6
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Light bulbs blowing,,,


Quote:
Originally Posted by Ranger31 View Post
I use a med household adapter. Made by Eagle.

This adapter screw in to medium (household) socket and converts it
to a standard 2-outlet plug receptacle. Then you can stick you meter
test probes safely into the receptacle two individual blade slots.
Someone has finally found a use for that adapter. I think I will toss one in the tool case. Beats pulling the fixture. Thanks.
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Old 09-11-2009, 12:15 PM   #7
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Light bulbs blowing,,,


That is a good idea
Now if I can just remember it if I ever need to test a fixture
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Old 09-11-2009, 02:38 PM   #8
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Light bulbs blowing,,,


Quote:
Originally Posted by Woodcutter View Post
The last light in the run suddenly started burning up bulbs - in seconds.
The light got real bright for a few seconds then went out. I thought it might be a defective bulb, so I removed it and screwed in another. It did the same thing! It's a standard 110v 15A SP light circuit. The other light on the line is fine. I pulled the light out of the can and put a meter into the socket and it read normal.
Bad batch of bulbs?
If not, your symptoms don't make sense to me which means I am assuming something that isn't true. But what could it be?

Voltage intermittently going between 120v and 240v for only this bulb? I think a 120v bulb run at 240v will instantly blow and that doesn't seem to be what you're saying.

Last edited by Yoyizit; 09-11-2009 at 02:41 PM.
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Old 09-11-2009, 05:51 PM   #9
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Light bulbs blowing,,,


Unless you have excessive voltage present, most likely you have a bad batch of bulbs that were excessively jostled during shipment. A bad socket can blow bulbs, but that usually takes at least a few minutes to get hot and cook the bulb from the base up.

Try this:

Switch off the lights, and wait for them to cool off! Never remove a hot bulb, expecting it to survive handling while the filament is hot.

Remove one of the "good" bulbs from one of the other lights, and install it into the offending fixture. See if it works, or blows!
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Old 09-11-2009, 06:57 PM   #10
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Light bulbs blowing,,,


Quote:
Originally Posted by kbsparky View Post
Switch off the lights, and wait for them to cool off! Never remove a hot bulb, expecting it to survive handling while the filament is hot.

Remove one of the "good" bulbs from one of the other lights, and install it into the offending fixture. See if it works, or blows!
"so I removed it and screwed in another. It did the same thing!"

I think you're onto something if he screwed in another hot bulb.
If not, I'd say call that Exorcist guy from the movie.
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Old 09-11-2009, 10:37 PM   #11
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Light bulbs blowing,,,


Quote:
Originally Posted by Ranger31 View Post
I use a med household adapter. Made by Eagle.

This adapter screw in to medium (household) socket and converts it
to a standard 2-outlet plug receptacle. Then you can stick you meter
test probes safely into the receptacle two individual blade slots.
Not a bad idea! Never even thought of that.
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Old 09-15-2009, 02:03 PM   #12
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Light bulbs blowing,,,


I want to get back to those of you who replied to my post with questions. I did install these lights myself three years ago. It is a dedicated 15A circuit that I ran when I built some built-in cabinets for a home entertainment system in my basement. Eveything had been working fine until one of the two lights blew a bulb a couple of weeks ago. There are just two lights on the circuit and two 110v outlets. The lights, on a SP sw, are at the end of the run, and the light that kept blowing bulbs is at the very end. Like I said, the other light has been fine. They are both small 45 watt spots in the small eye ball canister. When I first noticed the light out, I replaced it with my last 45w mini spot. Shortly afterwards I noticed it was out again. I only had a standard 60 watt bulb, so I put it in and in less than a minute, it also burned out. I pulled the cannister out and looked for a short or other defect in the fixture and did not see anything wrong with it. I pushed it back in and ran a test on the socket with my meter. It read about 115 volts. (PS - I really liked the idea of using the two prong screw in socket to test light sockets. I put the one I have with my meter so I can use that next time the situation arises!) We have been away for the past several days and I have not done anything with this since the original post. Last evening, I took the 45 watt spot out of the 'good' fixture and put it in the 'bad' one. I put a new lamp in the good fixture. Everything seems to be ok. I'm thinking that something may have been shorting in the can and corrected itself when I removed it and pushed it back in. If it continues to work, I'll pull the cannister again and look more closely for something that may have caused it, and to be sure I fix it properly. Short of that - maybe I just had a couple of bad bulbs - or I need to call that exorsist!

Thanks everyone.
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Old 09-15-2009, 06:24 PM   #13
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Light bulbs blowing,,,


Quote:
maybe I just had a couple of bad bulbs -


Any type of short circuit won't burn out a lamp.

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