I have found out of boredom that the most basic of materials can be used to make a long lasting candle thats a little brighter than a normal candle.
Step 1. Get a small glass container. Preferably one that was originally used for candles.
Step 2. Put some "not all" old candle wax into a container you can put on the stove and melt.
Step 3. If you have a checkbook and down to your last check just tare it out and take the spine of that and cut it about 1/2 inch longer than the wax is deep in the container.