I'm confused also! lol
If u go with the standard method of lighting...u will need 2 lights total.
1)
UVB light - It is recomended to purchase the ReptiSun 10. It is the long tube (not coil) & it should stretch across the entire length of the top of the enclosure.
2) basking light - u can purchase a basking bulb @ any pet shop or u can use a regular house hold light, just as long as the temps are accurate.
Or u can just purchase one Murcury Vapor Bulb (as the person above stated). This bulb provides both heat & uvb.
~Sandy