With the bi-xenons the standard filament bulb also comes on with HID main beam. I've previously upgraded my flash/main beam to a good quality Philips bulb at about a tenner each, which makes quite a difference.
Also worth considering if the light output is getting a bit low from the D2R HIDs that new bulbs are worth doing on age grounds, so long as you are certain of buying a genuine product. It's a minefield of fakes on ebay etc but there's good advice about to make sure what you're buying is genuine.
Don't believe anything on bulb web sites in terms of fitment - they don't seem to list the bi-xenons.
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===
2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus
2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC
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