I just used a basking light on one side. The 150w ZooMed ReptiBasking spot did the trick at about 19'' up. I used an adjustable lamp stand because temps change with seasons. In the winter I had a second adjustable stand with a dome and a 100w CHE at 25'' which kept the tank in the low 70s. I have a Solarmeter 6.5 which is great for measuring UVI.