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Old 16th December 2013, 08:12 PM
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D2R bulbs were originally designed for Mercedes-Benz. Consequently, D2R bulbs and D2S bulbs (used initially by BMW) feature subtle differences at the base of the bulb for fitment purposes. The differences primarily consist of a cut-out and notch for fastening purposes being located differently. In addition to the base varying slightly, D2R bulbs are easily distinguished by ceramic paint along the sides of the capsule, which reduces glare to oncoming traffic as these are placed in reflector type headlights.

D2S are intended for projector type headlights (Those with a lens) which is what our Audis with normal xenons have so you should be using D2S's on dipped beam.

I think that on the full beam of the xenon plus it will be a reflected fitment D2R bulb as it has a reflector behind it and a mask that drops down and up to flash and do full beam. Not sure about the dipped beam on a xenon plus.
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Last edited by Architex_mA8tey; 16th December 2013 at 08:17 PM.
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