8K vs 6K
Here are some more examples of the difference between 8K vs 6K HID's. I personally prefer the whiter look of 6K. Stock is around 4.2K (yellowish). My personal car (under signature) has the 6K's which I specified when ordering otherwise you will get 8K.
2012 BMW F02 750LiX, Alpine White, M-Sport, Dinan Stage 5, Dinan Exhaust, H&R Sport Springs, Coded, Paddles.
2012 BMW F12 650iC, Mineral White, Dinan Stage 3, Dinan Exhaust, Dinan Shockware, Coded.