I use a regular 40 watt bulb in the daytime and a 75 watt infrared bulb at night on my terrarium with the screen top. I use a ceramic bulb in the outdoor shed over my tortoises. Ceramic bulbs get very hot and can melt plastic. (Trust me on this.) It's best to hang or suspend them from above so plants, frogs, turtles or the tank don't burn. I like them because they don't put out any light at night. I'm still experimenting with light/heat sources and will have to invest in a timer. I have a new used set up that I am about to fix up, and will pick up frogs at Arlington Show in March. And Thursday I will be getting the Exo-terra tank with 2 White's tree frogs from a fellow OCHS member.