While I have yet to add them to my busa I do have HID's in my ZX9R, and I went with the 6000k. They do have a slight blue tint to them and you can still see very well at night. Also consider, depending on where you are from, tampering with the color of the headlamps is illegal. (Just laying out the facts). That being said I bought 2 sets off of Ebay and its been 4 years running!