My daughter bought me a couple of sets of those solar lights that hang from hooks or set on short posts. The ones I have don't put out as much light as an electric light, but they do put out some. Hung high, they cover a larger area than on a post, but the light doesn't seem to be as intense. You'd probably want to use 2 to 3 times as many solar lights as traditional electric ones for the same effect.
I like them because they don't cost anything to operate, plus the "automatic" on at dusk, off at sunrise is great.