4100K in a halogen headlamp=yellow output BUT brighter than 6000K 9Sill whiter than halogen though)
6000K in a halogen headlamp=blue output BUT not as many Lumans as a 4100K system.
6000K Philips burners are clear,the colour change is achieved by a different mix of gases/metals etc.Ones with a blue coating will be cheap Korean 4100K burners
8000K would be purple,the output would be shite and there wouldn't be ant point!
There aren't any cars in production(in europe anyway)that come with 6000K burners(ALL have 4100K)-they don't need it,the headlamp is designed for HID and they get a BLUER output than 6000K in a halogen headlamp!
Take some advice from Nick at autolamps-online.com.
He was on the development team at philips for HID so i think he knows what he is talking about.
