I have 35w 5k lows and fogs. DDM sent me a wrong bulb, which was 6k.. but I actually liked the color more. It just wasnt as bright. They fixed the problem though and sent me a new pair of 5k bulbs.
8k is just WAY too blue imo. It wouldnt be as bright, and would look odd.
Id def order from DDM Tuning again.