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#7190 - 01/25/02 06:02 AM burned out bulbs
buddy Offline
Member

Registered: 09/11/01
Posts: 11
This is probably a simple question for this group. A co-worker recently had a residence rewired and has experienced the light bulbs in one hallway burning out every couple of weeks. Any thoughts on what is causing this?

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#7191 - 01/25/02 07:59 AM Re: burned out bulbs
George Corron Offline
Member

Registered: 05/16/01
Posts: 728
Loc: Lorton, Va USA
Loose neutral (in home run, splice, etc.) poorly made edison base sockets for the bulbs, poorly made, maybe imported light bulbs.

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#7192 - 01/25/02 10:56 AM Re: burned out bulbs
Bill Addiss Offline
Member

Registered: 10/07/00
Posts: 4196
Loc: NY, USA
Bulbs could be loose or subject to vibration somehow from the floor above, slamming doors, etc. Try a rough service bulb in the fixture.

Bill

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#7193 - 01/25/02 07:57 PM Re: burned out bulbs
NoShorts4Me Offline
Member

Registered: 01/14/02
Posts: 35
Loc: southern california
As the others said. Most likely a loose neutral somewhere, obviously try looking at the fixture first. Last resort, try a 130v incandescent lamp. Covers many a problem.
Cheers
NS4M

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#7194 - 01/26/02 07:13 AM Re: burned out bulbs
Steve Miller Offline
Member

Registered: 08/30/01
Posts: 322
Loc: Loudoun Cty, VA
NS4M has the right idea. There is a formula for incandescent bulbs in our apprenticeship books that says:
(Actual Life/Rated Life) = (Rated Volts/Actual Volts)^13.

Take a 130 volt, 1000hr rated bulb and feed it 123 volts and you get:
AL/1000=(130/123)^13 or 2053 hours actual life.

In contrast, take a 120 volt 1000hr bulb and feed it 123 volts and you get:
AL/1000=(120/123)^13 or 725 hours actual life.

Those 130v bulbs are life savers in hard to reach fixtures.

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