The heat is at the top but the humidity is missing. I keep mine between 70 and 90%. 70% being the absolute lowest its ever been and 90% being right after I've misted. So it averages around 80%.

I was told that Whites need a UVB to digest there food but my Azy has been doing just fine with only a UTH for heat and a lamp/general room light to simulate day and night. I only plan to get a different light because I've started using live plants and they need the simulated natural light.