yes you need a H3C specific HID kit, and as for brightness, its really dependant upon the kit, each kit is somewhat different from the next, i have a bosch 8000k H1 HID kit bought through NYTSKY on this forum, i dont think its too bright or too blue at all. of course that will vary with peoples opinions.
As far as i understand, for optimal light dispersion you want no more than 6000k, anything higher and you start to lose the spread of light.