It also looks like you have three of the four quadrants of the lid covered over, but the fourth is wide open. If you use foil, you can rest the shade of the lamp right on the screen and wrap the foil right up to the lamp. The idea is to reduce the amount of exposed screen as much as possible. It may also help with heat, since more of it will be going into the tank instead of out into the room. You can also add an additional water bowl, handful of damp moss, or a damp washcloth sitting in a shallow dish, under the lamp.