Depending on the kelvin (K) u get determines the color of the light output. The lower the kelvin the more white they are. 4000K being a bright white, 6000K being a white with purple hint like the BMWs and all have, 8000K being blue, 10000K being purplish blue, and 12000 being straight purple. I used to have the McCulloch 8000K kit and it was very much blue. Now I have the 6000K kit which is perfect in my opinion. There are three websites that I know of where you can buy a kit. My car is on www.hidexperience.com under 8000K from when I had the 8000K kit and then there is www.superhid.com and ultrabrightlights.com. Installation is easy as hell too, there's plugs from bulbs to ballast u have to hook up and then u put it in like you would a normal light bulb. Hope this helps!