I looked at a HID conversion for my 500 but was put off by the price.
The following website gives useful info on HID Xenon. http://www.hids4u.co.uk/products.asp?cat=13
Looks a straightforward installation & they list setups for bikes so it must be something that is readily available & do-able
Do a web search to see what is available in your country
As I was doing a fair bit of night riding I replaced the standard halogen bulb with ordinary xenon and got a worthwhile improvement, it was noticeably brighter for not much cost.