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Rebel1 Rebel1 is offline
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Default Light bulbs burn out too fast

On 10/18/2011 10:12 PM, TimR wrote:
On Oct 18, 9:01 pm, wrote:
This apartment has strange problems. Incandescent bulbs burn out too
fast, usually when a switch is turned on. I monitored line voltage with


Yes. Light bulbs always burn out when the switch is turned on. That
is when the stress on a filament is the highest.

I have not seen a case where voltage swings caused incandescent bulbs
to burn out. Not saying there couldn't be, but I haven't run into it.

What I've seen cause it was mainly two things: screwing the bulb in
too hard, and vibration.

If you screw the bulb in too tight, you flatten the contact at the
bottom and then you have to always screw the bulbs in too tight. The
connection between base and bulb is easily compromised. Bulbs should
be inserted with the power on, and tightened ONLY 1/8 turn past
contact. If the contact is flattened, bend it out (with the power
OFF).


Thanks for the good tip.