The african fat-tailed geckos I haven't researched, but I can tell you that Leopard Geckos are noctournal. They don't require UVA/UVB...

The best thing to use with them is a light strip above the cage that takes bulbs, and use the blacklight night-time heat bulbs in it. Make sure you get the right size bulbs for the hood. Some are long tubes, others look like regular light bulbs.

Good luck!