Even running a 35W HID bulb in the stock housing will drain the battery after ~45-60 min depending on RPMs. You will need to re-wind your stock stator and run a DC regulator (oem is AC/DC).
I am running a 35W headlight bulb (H6M) in place of the stock headlight bulb, which just plugs and plays. I mounted the 35W ballast behind the number plate and ran a positive and negative to the battery (with inline fuse, and sealed switch of course).
DDM Tuning is a local HID retailer for mostly automotive products but they do have motorcycle bulbs as well. So far, 2 solid years and countless hours of running with the light and no issues. At first it would cut out a lot but I figured out that was due to dropping voltage from the stator not putting out enough to re-charge the battery.
It's a great fog light, and works well for me in the dunes, and desert... but you can 'run out of light' going fast in a flat high speed desert. Decent projection, but I have been looking at the baja designs squadron kit...
Side note: it is awesome having the light wired to a switch! Loading bikes at night, I just turn my bike's light on and we will load up the bikes then mine last. Also good to have incase your bike is acting up and not running you can signal people with the switch light. Food for thought