Just installed a 35w 4500k Kit in my 2011 Mazda 3i, and boy does this kit put out light. I had an amazon LED kit in there when I bought the car, and this kit kicks those to the curb. The color of the 4500k is closer to 4000, but thats actually what I wanted. I am quite pleased with this kit, will buy again.
Only one minor gripe, one bulb seems ever so slightly dimmer than the other, but its only noticeable if you get a light meter out after they warm up.