Does the audi a6 halogen headlamp use the same projector as the HID one? I found a cheap deal on the halogen ones but if different projector would it be worth it still? And I just bought a pair of bosch ballasts. and I think it was hid planet that had philips d2s bulbs for $75 a pair... is that a good price? Sorry for being such a noob and thanks herman for writing such a great faq. Much has been learned!

-Chris

I think Audi A6 Halogen projectors are made by Hella and are very similar to Hella low beam HID projectors with a 90mm lens that are found in a BMW X5 and E39. I do not know of anyone who has tried usinf D2S in those Halogen Hellas. May be you'll be first.

they aren't a d2s bulb holders are they... will I have to mod the housing to use those projectors?

BTW, I am selling a pair of almost brand new Philips D2S Bulbs. I bought them but didn't like them. I like the Osrams better even though they are dimmer simply because it has a slight tint of pink to it whereas the Philips is much brighter and whiter with a slight tint of creamy/yellow. Asking price $70 shipped.

Where are you located at? and if you still have those in a week or so I'll take them

Quote: Does the audi a6 halogen headlamp use the same projector as the HID one?

No.

Differences:

Bulb socket is different

reflector bowl has a slighly more V shape as opposed to U shape. This is hard to see for the naked eye.

Possible differences:

reflectivity in refeclector bowl

degree of fresnel rings in curved lens

front shape of curved lens. This is hard to see for the naked eye.

distance between curved lens, shield and refelctor bowl. This is hard to see for the naked eye.

shield layout. This may be hard to see for the naked eye.

Identicals:

overall physical measurements

Screw mounts

Colors of non optical areas.

There may be more that I can't think of right now....