Here's another link you can use for ideas. Read all the way through the thread because there are alot of "bumps"...
http://www.repticzone.com/forums/Bal...s/1971927.html
Also, since you are using a glass enclosure, the ambient daylight and night time are sufficient for a light cycle. It only becomes more important if you are housing them in tubs or getting them ready for breeding...
Hope this helps...
Rob