I have a few strings of led icicle christmas lights which I plug into my inverter and they put out quite a bit of light and only draw a few milliamps of juice. I have a small generator to keep things charged. The led christmas lights are a little pricy but they are brighter and safer than oil lamps or candles and they last for a LoooooooNG time.
I cannot say what a bargain those Christmas LED lights can be, especially after Christmas. They make excellent emergency lights. With a mild deep cycle boat battery and a small cheap inverter you can get a long running emergency light from them.