headlamp bulbs don't last long

[Boog]

We've got an 03 Tahoe and are replacing headlamp bulbs way too often. We are using Sylvania bulbs and we are having to replace one side or the other about every 5 months. No other light problems. Any ideas what would cause the rapid failure rate?
I use the same brand bulbs in my 2000 GMC and do not have this problem.

[ssxty8]

Humidity inside the headlamp assy? Alternator charging too high? Vibration due to loose headlamp assy?
Just my 2 cents.
Good luck.

[Tropical Snowstorm]

Moisture intrusion would be my guess as well. Make sure you do not touch the bulb itself too, I always put on a pair of nitrate gloves to prevent oils from the skin messing it up.

[Boog]

I have not noticed moisture accumulation inside the lamps and I am aware of the clean touch issue. Alternator output looks to be normal. These headlight bulbs are the only ones with the shortened life. I might look at the ground wires.