I have replaced one H7 bulb on my 2001 A4. I have over 70000 miles, so that
is well over 1000 hours of driving, most of that with the lights on. I have
had one failure (low beam of course). I would say that isn't too bad.
For the cost of an HID setup, I can buy a lot of H7 bulbs.
To avoid aggravation, you could simply replace the low beam H7 bulbs every
50,000 miles or so, even though they haven't failed. The high beam bulbs
probably will never burn out, since they are on so much less.
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.