Headlights keep goin out and xenon conversion
 

Hey guys, i'm new to forums like these but i'm really curious if there's a solution to my problem. I have an 03 a4 1.8t manual and my headlights keep goin out. i have to change them every 2 months(best case) and i was wondering if anybody knows why this happens. And also i was curious what i have to buy and where to change my normal halogen headlights with xenons.
Thanks.