I've had my beardie for about 5 years now and she has a full screen top and it's always taken a lot of tinkering to get the heat at an acceptable level. I'm not sure if it's the screen top or what but there was a lot of money spent on trying different bulbs along the way.
I've used screen tops and no top at all. I have the basking bulb fixture on an adjustable stand so I can raise and lower it as needed in order to get correct temps.
Mirage came out of brumation on April 26. He was doing great. On May 2 he started acting funny. We just redid his tank, and he keeps going into one of his hides. He just lays there. He shows no intrest in food. HELP!