Just changed both of the xenon bulbs on my C5 with these http://www.ebay.co.uk/itm/PAIR-D2R-FACT ... 35c02c5c44 in 6000K cos one of the originals popped. Now the originals were pretty dim but the new one's are no better if not slightly worse
The main beam is superb with Osram - Night Breaker plus if only the dipped were the same