The ring clip got me pretty good the first time too :-)

 

Hi Ron,

So you were able to replace your OEM HID's? To confirm your bulb type was D1S.

 

Do BMW Xenon D2-S 35W (63217160806) dim with age?

Or is it a ON then OUT situation?

My car was built in Oct 2004 and has 100k miles on it.

Mileage will vary I know but what are the operating principles for Xenon headlight bulbs?

 

I don't know about on/off.. mine were 9 shades of blue before they died (slight exaggeration)

Confirmation: lol