I had a h4 hi/lo 8000k hid setup on my Suzuki katana ay50. It ran perfectly and made a huge difference! I do mean a huge difference! Personally I wouldn't buy another 8000k set as they where a little too blue, but a 6000k set is definitely on the cards for my Aerox I just bought. Thought I'd share my experience and knowledge
The ac power that usually powers the bulb plugs into a relay which determines hi/lo settings. The dc power is then drawn from the battery and my battery ever got depleted of charge. That is how mine where wired anyway..