Don’t forget about kerosene lanterns. The ones with the circular wicks, though a bit tricky to operate, give off a very bright light. And the thing with kerosene is, you are confronted directly with the burning of a fossil fuel (and its smoke). You have to think about whether it’s really worth wasting the fuel to stay up another half an hour just to read something you’re too tired to fully absorb anyway. Beeswax candles are of course much nicer, but hard to read by.