I had to do it. I bought the 55W 4300K HID(High Intensity Discharge) kit from HIDworld and I have to say their service is very good, and fast. And fitted it to an existing light I had which just had a H4 Halogen globe in it. I also managed to come up with an easy way to focus the beam externally by mutilating a child plastic telescope. See pics:
THE FINISHED PRODUCT
THE FINISHED PRODUCT