Thank you. I think I am confused about coil lighting. I have no coil bulbs. I thought the housing I was using for the basking light was called coil. I’m sorry. He is approximately 4 or 5 yearsYou need a solid clear bright white basking bulb that keeps temps to what you need them - examples are Exo Terra Intense -- Flukers basking-- or Arcadia Halogen - digital probe thermometers to get actual surface basking temps - how old is the dragon? Please get a piece of basking decor directly under the UVB approx 12-15 inches --NO more coils -- please get rid of them