I never noticed a major colour difference between HID and main beam support with the ones I had - they're certainly bright enough to be effective!
We used the H7s in our C5 A6 as headlight bulbs and they averaged a 2 year life - after fitting on the S8 I never needed to replace them as they obviously aren't on anywhere near as much
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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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