There are 2 options, personally i started using option 2 afew weeks ago and the result is good.
Option 1: A Incandescant light bulb that creates a basking spot between 85 and 90 degrees, and you need a UVB Tube, zoomed, 5.0 uvb
Option 2: You only need a Mercury Vapour bulb, the 100 watt one made by Zoomed, it combines a basking spot and UV together. They are EXTREMELY sensitive to bein bumped when they are hot though