www.ddmtuning.com

check them out, have bought many set from my cars and now my bike, great product, fast shipping, and lifetime warranty. and 35w and 55w kits. i have 55m 5k and love it.highly recommend this company. becarefull with the cheap kits they suck, these are cheap also but i have had about 5 sets from them and never had any problems and a lifetime warranty, you cant beat that

between 4500-6000k is the best visibility, anything after that is mostly for color, dont get me wrong they are still bright but after 6k you start loosing light