pocketchange

OK, I have noted that a D2S Series bulb is required.

Looking into the forest, I see the good people with Philips have 2 part numbers.

85122 & 85126, maybe more?

Looking for advice on which to choose..

85126 is rated at 4300K, not sure about the 85122.
Also , it appears a Gen III version is available (supposed to be HD?)

Thanks, pc

silverd2

85122 is the correct Philips number to match the Audi part number N 104 457 01 (ETKA)...and it's also 4300K, the correct color temp (Kelvin scale). Higher color temps start going blue...anything above 5000K...ghetto blue bulbs are 10-12000K.

Example (read description, bottom of page):

http://www.ebay.com/itm/NEW-Philips-...550530&vxp=mtr

pocketchange

Thank You Sir..

silverd2

IF you have Xenons (D2S), those are your low beam bulbs.

Problem with xenons is that when they go out, it can often be the igniter or ballast that's bad (not the bulb)...each bulb has both attached (gas bulb requires em...like a florescent).

If only one xenon is out, you should 1st switch it with the other side, to insure that it IS the bulb and not the igniter or ballast attached.