Pat- unless the lights you have are designed to focus the "arc" of an HID, IMHO, it's better to just use relayed H4 80/100 in Euro headlamps.

Also, if your headlamps are H4, you'll most likely lose your high-beam as well.

I guess if you want the least load to your alternator, HID's are a way to go.

:-) neil
1988 360TE AMG
1993 500E