This is something i am doing right now. I am using exo-terra glass tanks and the screen top is has two support bars in it, one in either direction.. So we went to the home depot and had 3 pieces of plexiglass cut, one for each of three sections. Over the fourth section i hung my heat lamp, as my house is cold in the winter, but, the lamp is hung on a bracket that is attached to the back of the tank so it is 4-6 inches over the screen. I also use deep dome lamp fixtures. My reptifogger also fogs through that open section. It works great. The lamp bracket i found at Petco.
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