Yes but the headlight is modified to spread the HID beam pattern in such a way that it doesn't cause glare. Trust me, go look it up, it's actually pretty technical so I'm not going into detail.
I have 8000k and I can see much better than my halogen lights. No matter what anyone says, any k of HID lights put out way more lumens than halogen lights. So get what you want, and the light output does get worse, but not by too much. I'm about to switch it up to 10000k
Super bright blue looks so mean...I might do it later today...hhmmmm