Ref the Philips headlight bulbs, I went through 2 sets in our old A6 with projectors - average life before 1 died was 2 years, but they're so cheap to buy it isn't a major issue.
The A6 had no access issues though!
Ref wattage of HID - they will only work with what was specced as far as I understand it. They're part of a specified system based on electrical system configuration, so the higher wattage bulbs don't mean they're actually any brighter. Everything else being equal you would draw twice the Amps and have half the resistance going from 35W to 70W.
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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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