I have one of my balls in an exo terra tank and use a heat emitter to raise the ambient temp. The heat emitters are better than the heat lights imo because you can leave them on all day and night without interrupting the animal's light cycle. Even with a heat emitter though you need to have a way to control it because they get very HOT. I use a lamp dimmer to control the heat emitter and a thermostat to control the UTH. You can find most of what you need at http://www.reptilebasics.com/. You should be able to find a lamp dimmer at your local walmart or hardware store.