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Old 06-08-2010, 02:03 AM   #1
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bulbs stop working quickly


I have a ceiling light fixture in my entry hall that is just a couple years old. It uses four 25 watt clear globe bulbs. Lately, I'll replace the bulbs in a couple of the sockets and they stop working again within a week. I'm wondering what might be causing this? Thanks in advance for any advice.
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Old 06-08-2010, 05:45 AM   #2
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Bulbs not seated tightly on the contacts. Sometimes due to the bulb length, sometimes due to the cardboard cover over the socket. Another possibility is a bad connection at the wires, but all lights would probably go out if that were the case.
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Old 06-08-2010, 05:50 AM   #3
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Vibration, overvoltage.
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Old 06-08-2010, 06:08 AM   #4
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Add to the vibration and over voltage---Bad batch of bulbs---It happens.
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Old 06-08-2010, 07:00 AM   #5
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Can you tell if the filaments are broken?

Failure with the filament still intact could be due to insufficient seating in the socket resulting in overheating and melting of a contact down there.

Low wattage 120 volt incandescents (under 30 watts) have very thin filaments that are more sensitive to vibration.

With the breaker turned off you may be able to reach into the socket with a bent paper clip and raise the bottom contact a bit to get better seating of the lamp (bulb).
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Last edited by AllanJ; 06-08-2010 at 07:04 AM.
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Old 06-08-2010, 08:16 PM   #6
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Go to an electrical supply house and ask for rough service bulbs. The filaments are made to really get beat up. We had to use them in MRI rooms because the magnet made the filaments bounce like crazy. Knocked out around 30 lamps in 4 days.
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Old 06-08-2010, 08:22 PM   #7
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Maybe they are producing too much heat, just for fun, try a few CFLs. Maybe start with just one. You could also check the voltage at the socket to see if it's way above 120. It's tricky to get the electrodes in the socket and can be a hazard if you slip and cause a short, so you could get one of those "bulbs" that turns a socket into a plug, then put the electrodes in the plug to test.
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Old 06-08-2010, 09:19 PM   #8
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Quote:
Originally Posted by Red Squirrel View Post
Maybe they are producing too much heat, just for fun, try a few CFLs. Maybe start with just one. You could also check the voltage at the socket to see if it's way above 120. It's tricky to get the electrodes in the socket and can be a hazard if you slip and cause a short, so you could get one of those "bulbs" that turns a socket into a plug, then put the electrodes in the plug to test.
Actually I hadn't thought about that. Overvoltage might cause bulbs to burn out. I know they make bulbs that are rated for 130volts.
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Old 06-08-2010, 10:19 PM   #9
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Quote:
Originally Posted by goose134 View Post
Actually I hadn't thought about that. Overvoltage might cause bulbs to burn out. I know they make bulbs that are rated for 130volts.
Yeah it's usually the first thing I check as it's easy, but could be all the other things too. I was thinking maybe even overheating, if it's an enclosed fixture.
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