I bought a Coleman lantern that takes 4 D-cell batteries that lasts up to about 30 hours on high and 60 hours on low. Now I'm thinking that D-cells are pretty expensive. I might need 200 for one year at that rate. I could buy oil lamps and burn kerosene but I wonder if candles would be better. What candles do you people think would be best for providing light? Where do you buy them? How much do they cost? How long do they last?