I have a rescued Sulcata that my boyfriend and I took ownership of probably around last April/May. He had a really nice outdoor enclosure and he used to only come inside at night (we have a lot of predators in our area), but now he's permanently inside for the winter and until we move (I go to bootcamp early next year!) I purchased two ceramic heating bulbs but every time I turned them on, they began smelling burnt and I was nervous to keep them on in case they started a fire. It's getting rather cold at night now and I need to find a new heating element or brand of ceramic bulbs to try. Wilferd is 6 years old and approximately 20-25 lbs his tank is 21" tall if that's information that helps.