Well it is a Under tank heater (UTH) not a light. But you will also need to get a thermostat to go along with it, otherwise the temps can spike on it causing your BP to get burned. You can get one of these (the under tank heater) at basically any pet store. And the thermostat you can order from reptilebasics.com or beanfarm.com . The link that I had posted goes over alot of that, and shows you how to use a thermostat and shows you the accurite (thermometer) that is good for both reading the temps as well as humidity.