Five of those little fellas on a usb hub could throw some serious light.
When I'd be using a trouble light is when I can least afford to use the electricity. So I'm in favor of the lowest load solution, which is of course LED. I was at the marine supply the other day and saw 12v screw-in cabin light bulbs in the 7 - 10w range. If I wanted to really flood the campsite and already had the cord and fixture I'd get one of those.