Your W12 has the top of the range ones but I agree bi-xenon is poor.
The best would probably be the xenon dip with halogen main beam but only comes with no DRL or cornering function.
I have read one can also get better bi xenon modules to replace the one in the lamp housing- the ones we have are Hella Gen 4 bi xenon. If you have a lamp off the car, it should be easy to see if it can be withdrawn from behind and measured up for an upgrade.
I have replaced my D2S bulbs with Osram CBI and they focus the light further up the road on main beam than the old ones. There is a sort of hot-spot when shining them on a wall.
Last edited by snapdragon; 18th January 2015 at 08:13 PM.
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