As for UVB and UVA - get your self some tube versions and replace your current one.
Tube Type: REPTI GLO 10.0 UVB TUBE [Check Ebay]
If you have two way lighting:------------------------
replace 1 light with a UVB and one with a UVA and that should do the trick.
If you have one way lighting:------------------------
look in to something that will provide you with both UVB and UVA. Bulb Type.
Like all the other folks on here keep saying lollllllllllllllllllllllllll - Take out your gravel
as your turtle will eat it and then you will be in major trouble.
Hope the information above is helpful.
Regards, Jagz