Davis 3300 Mega Light
http://sailnet.com/store/item.cfm?pid=17641
This fits the bill without having its own battery/solar cell. Otherwise try combining this with a
solar cell and
battery from a self contained garden light. They're
cheap.
Instead of running it off of its own battery, I would want it to run off my main bank since it will probably have a more efficient
charging scheme and the light draws very little
current.