2004A8L

Do they decrease in performance over the years or is it they either work or don't?

Jack88

They change color and degrade a bit before failing completely, seems like.

ScottCNelson

Just replace one side and drive a dark road at night.

2004A8L

No issues with them, they work they just aren't bright (white) as they used to be, now turning more yellowish.

Sci-fi_Wasabi

How have you narrowed it down to Ballast or igniter, rather than just bulb age? Also, what would you replace, that square igniter that the bulb inserts into, or the ballast module which is much more expensive?

2004A8L

I didn't that's why I'm asking do they decrease in performance over the years lol. Bulbs are about 2 yrs old and no they not the cheap ones. Headlights lenses are cristal clear too.

Sci-fi_Wasabi

When I got my new Osrams Nightbreakers last month, I did ask the seller about new ballasts out of curiosity since one of my old bulbs was bluer. He said a failing ballast is a typically a situation where they just stop working. In some rarer cases you may get a bulb going violet 1st, then shortly afterwards not lighting up. That was just his general advice, it was not Audi A8 specific. He did remind me to clean/polish my head light housing for brighter light.
Anyway, maybe someone with experience with actual ballast or igniter problems will chime in.

2004A8L

Cool thanks for the info. I never had any problems with the lights not turning on or flickering. I'll start with a new bulbs and go from there.

2004A8L

Bulbs arrived I'll replace them over the weekend. Got all 3 sets D2S H7 H11 for about $210