You do understand that putting an HID bulb into a halogen reflector housing is not an HID lighting system, no?

An HID system (i.e. bulb, ballast, AND a proper HID reflector) is indeed brighter and more efficient than halogen... but fitting $60 eBay crap into your lights ain't.

The Clearwater lights linked above are top notch quality and performance, hence the price. Rigid Industries are good too and a bit cheaper.

The Morimoto Mini from The RetrofitSource is a full retrofittable HID SYSTEM, not a hodge podge of mis-matched pieces kluged together.