I gave up candles a few years ago. I use oil lamps and LED lights.
I have a 12-LED lantern (from Cabalas) that uses 4-D batteries, I have not changed the batteries in it for going on 4-years, I bought it with batteries in it and it still has that set in it (A $50.00 light discounted to $15.00 because the remote was missing.) I check to make sure they are not leaking, but the lantern keeps working, and is fairly bright as far as battery powered lights go.

For oil lamps I have a collapsible backpacking lantern that runs 15-hours on 2-oz of lamp oil. I also have 6 railroad lanterns that were in my grandmother’s garage. They all work well. They may be worth a lot, never looked them up. 4 of them have the matching RR line name etched into the glass and stamped on the lantern. Don’t really care what they are worth as I don’t plan to sell them.