If both fixtures are on the same switch. The problem has to do with the flow of electricity one (the one always burning out first) is recieving an inrush of current each time they are switched on and the other one is getting a lesser amount. initially. The inrush causes premature breakdown on the filaments.
Get a 130v bulb for the fixture that always burns out. Use a standard bulb for the other fixture. You can find them at a lighting or electrical supply house. Ask for the rough service bulbs. They have a heavier filament and are usually rated for 130volts instead of 120volts. I have a single fixture in my bathroom that used to eat bulbs. I even tried the fancy flourescent bulbs, it was toast in 2 months. I switched to the rough service 130v bulb. and it is still burning 3 years later.
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Been There, Couldn't do that, No Money, Maybe next time.
I did get the T-shirt, but I've put on some weight so it don't fit.
It made a nice grease rag!
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