With HID Kits,
I had 6000k HID's on my car, pre fitted when I got it.
One of the Ballasts has died and I am looking at getting new HID's.
The question is:
Do I have to change the bulbs between 6000k and 8000k or just the ballast?
and What is the difference between H1 H7 etc,
which one do I need on my Mk4 standard headlights?!