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Old 05-14-2010, 06:00 PM   #1
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Bulbs breaking in lampost


I recently moved into a house and having been having issues with the lampost outside. At first it didn't work because of a short, but was fixed by rerunning new electrical cable to the post fixture from the nearby gfci that is tapped to provide power. Now after a few months of working properly, the bulbs are physically breaking. A sizable section at the top of the bulbs is shattering. I am on the 5th bulb now and they last maybe a week. Is there a situation where a bad connection can cause bulbs to break like this? would imagine it would take a surge and at that it would cause more of the entire bulb rather than the a section of the top. The lamp fixture is rather loose on top of the post. t does not appear that the bulb can bang on aything, but I was wondering if maybe getting shaken by wind and rain while the glass is hot could the cause behind the breaking.

Any ideas or opinons?

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Old 05-14-2010, 06:13 PM   #2
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Bulbs breaking in lampost


Where are you located ?
What type of bulb, wattage ?
Has it been raining, can water get in thru the top ?
Cold rain hitting a hot bulb will usually cause it to shatter

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Old 05-14-2010, 06:23 PM   #3
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Bulbs breaking in lampost


In northern west virginia, temps have been ranging over the last month from upper 30's to upper 70's at night. Yes water gets in, in fact a few times ive found water actually in what is left of the bulb. I have been thinking of trying to find something to use as a gasket for the lid and/or glass. The bulbs are the smaller A15 40 watt incandescents.
Would the suggested action be to try and tighten up the fixture and find a gasket to seal out water?
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Old 05-14-2010, 06:26 PM   #4
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Bulbs breaking in lampost


Yup, seal out the water & that should stop it
Any water getting in could short this out & cause a shock hazard too
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Old 05-14-2010, 07:01 PM   #5
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Bulbs breaking in lampost


I agree. Water dripping on hot bulb is shattering it.
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Old 05-14-2010, 08:27 PM   #6
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Bulbs breaking in lampost


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Originally Posted by joed View Post
I agree. Water dripping on hot bulb is shattering it.
I can't imagine what else it could be.
Lower wattage bulbs may be less sensitive to this type of thermal shock. The glass may not get as hot.

Last edited by Yoyizit; 05-14-2010 at 08:30 PM.
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Old 05-14-2010, 10:14 PM   #7
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Bulbs breaking in lampost


Yep sounds like water or snow. Same thing happened to my car headlight not to long ago. It's broken and I did not get it fixed yet, and we had a snow fall recently and it exploded.

I would suggest putting that circuit on GFCI as well, just to be extra safe, if it's not setup that way already.
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Old 05-15-2010, 10:50 AM   #8
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Bulbs breaking in lampost


Put a CFL bulb out there, with an outer "bulb" (swirly part enclosed).

Cold water hitting it won't cause it to shatter, due to the operating temperature of the bulb.
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Old 05-15-2010, 10:34 PM   #9
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Bulbs breaking in lampost


It is on a GFCI, there is a gfci outlet out front that its attached to. If there had not been then there could have been serious issues when the cable was shorting out when I first moved in. I'm going to take apart the housing, retighten everything so it doesnt knock around, and seal up everything with a little bit of silicon on the inside.
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Old 05-17-2010, 09:56 AM   #10
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Bulbs breaking in lampost


Quote:
Originally Posted by Yoyizit View Post
I can't imagine what else it could be.
I got an idea....................................















But probably the water.
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