Keep in mind that any bulb with a color temp over 4300k is sacrificing some performance for looks. Once you get past 6000k it is very noticeable. i woudlnt recommend anything over 6000k as it looks illegal, and is also cutting your light output significantly. 4300k is the standard HID bulb color temp for every car maker, but projector headlamps make some cars headlights appear to have a very blue tinge to them. 6000k bulbs due a nice job approximating that color, and dont sacrifice much compared to 8000k, and the other completely useless bulbs higher than that.