We did a bathroom remodel, bought two new light fixtures for each vanity. Put in some GE Classic LED bulbs, 60w replacement, 500 lumens bulbs. The link below saw to use 40w replacement - perhaps that is the issue, but with LED it doesn't draw that much right, so it sort of doesn't matter?

Within weeks, one bulb would burn out. Replace - a few more weeks later, another bulb...this process has continued for over a year now.

Called the lighting manufacturer - they said to use A15 medium base bulbs, so I did - same issue. They then sent me brand new light fixtures to replace them with - same issue.

What is causing this to happen? ...and to answer some questions:

a) no those are not enclosed
b) bathroom is large master bath
c) NOT on a dimmer switch

https://www.lampsplus.com/products/possini-euro-lighting-on-the-square-29-inch-wide-bronze-bath-wall-light__m9189.html

...also just noticed we have them upside down I guess, pointing downward

Same socket each time? Could be an iffy connection. Check the wirenuts. Check the wirenuts back at the switch too.

different bulb, and when I replaced the fixture they gave me on both I made sure wirenuts were tight in the fixture. What is weird it is happening on both fixtures - each has their own switch. That is a double on the wall, so wondering if in that switch box there is something strange going on to affect both.

Could be either be a hot or neutral in one of those switch boxes that branches off to the other box? Just spitballing.

Doesn't sound like a fixture issue to me.

each fixture is on its own switch, but the switch box has 4 switches in it - Vanity1, Vanity 2, overhead cans, fan.

I'm thinking it's just messy in there or something is loose?

That's where I would start. Check wirenuts and lugs for tightness

why would two different fixtures be affected though?

Generally speaking, power will come into a box and then split to multiple devices. This split is done with wirenuts or sometimes on the line side of switches or outlets. Same with a neutral. There are a lot of ways to tackle this. No telling in a 4 gang box what they did without looking at it.

Check the connections at the switch too.

If it's upside down, there is also a chance that the controller in the bulb is getting too hot. The cheaper bulbs are not made in a way to consider the cooling, so that is generally the weak link. Does the base of the bulb feel hot when you change it?

Yeah I guess you could say they're hot…able to be handled and changed so not burning me any.

Maybe first step is to flip the fixture so bulbs screw in downward and cover opening is up