For something entirely different, consider the Luci light or similar. These are solar powered and self contained. They consist of a solar panel, some sort of battery and LED lights in a collapsible, inflatable container. Unexpanded, it makes a serviceable flashlight. Expanded, it is a very nice area light (its best use). I have found these very useful when camping, and they are light enough to consider for backpacking. Best of all, they are not dependent upon the grid (though sun light is handy).