I hate watching videos, so I did a little looking around about the tea light idea and found this. What is interesting is the idea one of the commenters came up with.
http://www.instructables.com/i...
Scroll down to the comment by ewbray on that page. His idea is to use an empty tuna can filled with solid shortening (melted, then re-solidified to remove air) and using birthday candles for wicks, instead of using tea lights. Says it works for a longer period of time.