Using heat tape inside an enclosure is not recommended. It's nearly impossible to make a perfect seal and should humidit get to it, or a water dish gets spilled, their could be serious consequences. An alternative to using lights and ceramic heaters in the enclosure are radiant heat panels. They are safe and effective, they don't dry out the air, and last a long time. They are also energy conservative. They are a little pricey initially, but a very good investment. Hope this helped some