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Old 03-18-2009, 10:12 PM   #1
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Light bulbs burning out


Again I was over helping a friend with some light fixtures. Their light above the sink says it is rated at 120v 75w. The bulbs they are using are a 65w, yet they are burning out within a week.

Are they maybe a bad batch of bulbs, can't think of anything else since the wattage is lower then the max for the fixture.

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Old 03-18-2009, 10:17 PM   #2
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Light bulbs burning out


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Originally Posted by Michblaze02 View Post
Again I was over helping a friend with some light fixtures. Their light above the sink says it is rated at 120v 75w. The bulbs they are using are a 65w, yet they are burning out within a week.

Are they maybe a bad batch of bulbs, can't think of anything else since the wattage is lower then the max for the fixture.
more of a voltage thing...get 130 volt bulbs they have sttronger filament...you need to check the voltage...but, if i had to guess you have a bad batch of bulbs

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Old 03-18-2009, 10:29 PM   #3
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more of a voltage thing...get 130 volt bulbs they have sttronger filament...you need to check the voltage...but, if i had to guess you have a bad batch of bulbs

It was sitting at 122v consistently. So same wattage bulbs with a higher voltage rating . Could anything else cause bulbs to blow so quick.
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Old 03-18-2009, 10:41 PM   #4
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It was sitting at 122v consistently. So same wattage bulbs with a higher voltage rating . Could anything else cause bulbs to blow so quick.
i'd try a different brand of bulb
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Old 03-18-2009, 10:46 PM   #5
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Light bulbs burning out


I will let them know. The white plastic around where the bulb goes in was a bit discolored as well. Signs of it being rather hot, would a higher voltage bulb with lower wattage help with lowering the heat output from the light.
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Old 03-18-2009, 11:02 PM   #6
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Light bulbs burning out


Vibration could shorten lamp life, as could a loose connection.

That is a very short lifetime. 122 volts into a 120v bulb should give you 100[(120/122)^14] = ~80% of rated lifetime and 44% for a 115v bulb.

Last edited by Yoyizit; 03-18-2009 at 11:07 PM.
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Old 03-18-2009, 11:04 PM   #7
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Light bulbs burning out


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Vibration could shorten lamp life
yeah,do you live under an interstate?
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Old 03-18-2009, 11:22 PM   #8
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Light bulbs burning out


One time my wife brought home a quanity of light bulbs that were on sale - cheap. They did not last long at all - seems I spent the next year or two doing nothing but changing light bulbs until I used them all up.
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Old 03-18-2009, 11:31 PM   #9
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yeah,do you live under an interstate?
Or have a honeymoon couple upstairs?
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Old 03-19-2009, 01:41 AM   #10
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Light bulbs burning out


If the heat can't escape effectively, lamp life can be reduced substantially. Vibration can also be a problem. Voltage too, of course.
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Old 03-19-2009, 06:19 AM   #11
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Light bulbs burning out


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If the heat can't escape effectively, lamp life can be reduced substantially. Vibration can also be a problem. Voltage too, of course.

It is definitely getting warm under the glass housing. I guess a lower wattage bulb would help somewhat with that. No vibration though, they live on a quiet dead end road, and ranch style house.
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Old 03-19-2009, 12:39 PM   #12
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Light bulbs burning out


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It is definitely getting warm under the glass housing. I guess a lower wattage bulb would help somewhat with that. No vibration though, they live on a quiet dead end road, and ranch style house.
Vibration as in people stomping around upstairs while the light is on, or doors slamming close by while the light is on.
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Old 03-19-2009, 01:18 PM   #13
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Light bulbs burning out


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Or have a honeymoon couple upstairs?
\hahah...nice one

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