Harbor Freight has these lights on sale.
http://www.harborfreight.com/12-volt-halogen-vehicle-work-light-93904.html
I have used them for lights on the front, doing the normal relay/switch/idiot light wiring. We have a night ride coming up, and the stock reverse lights leave a little bit to be desired. Anyone had experience with wiring a light like this into the standard reverse light wire and not thru a switched relay. Bumping up the fuse is mandatory, and I'm thinking it may not be as bright as when I wire them up on the work trucks, or tractors, but it has to be an improvement over stock