My girlfriends dragon is homed in a "reptile habitats" 120 gal 2'x4' enclosure with a screen top and sliding doors. He seems happy and healthy but theres got to be a more efficient way to heat his home. My 7 fish and reef tanks combined use less energy then this one enclosure. She has 2 ceramic heat bulbs, 2 heat lights and a uv. Probably close to 500 watts in just bulbs to keep his basking spot around 100 degrees. whay are some more efficient heat sources or tips to make heating his enclosure more energy efficient. Thank you!