Hello,

I've recently run into several cases where a fixture was burning out its bulbs in a matter of weeks, or even days. In one case, I was told that swapping the 60 watt bulb for a 15 watt bulb made it last significantly longer.

I'm at a loss as to how to troubleshoot these cases. Where do I start? Do I look for loose wire connections, faulty sockets, or what?

Thanks in advance,
Moishe

Forgot to mention: these weren't junky 99-cent store bulbs; these were brand name bulbs, like GE and Sylvania. So it's definitely not a case of low-quality bulbs burning out too quickly; there is something wrong with the fixtures - but what?

Many times higher than normal voltage will shorten the life of incandescent lamps. However if you had high voltage, other lamps in the home would be burning out.

The globe of a fixture can entrap heat, causing the lamps to fail prematurely.

Sometimes the socket contacts are loose, or pitted, or a loose wire connection at the socket can cause voltage spikes at the socket to cause the lamps to burn out.

So:
1. Measure the voltage at the fixture, should not be more than 120 volts+10%, or 126 volts. If the voltage does get close to 126 volts, then use 130 volt rated lamps.
2. Inspect the globe to be sure it does not entrap heat. The lamp being used may be larger in watage rated for the fixture.
3.Check all connections, including the inside of the socket, the bottom "hot" contact can get pitted, and the heat can cause the wires to loosen in the crimp connectiors. Replace the socket if necessary.
4. Excessive vibration can cause a lamp to fail. If this fixture is subject to vibration, then will need to use "Rough Service" lamps. The filaments are supported better than standard household lamps.

Hope this helps. I have had many service calls for this problem, and the solution has been one or more of the items I mention.

Consider changing to compact flourscent lamps.

Thank you very much. I will try those suggestions.