I'm guessing you have a glass tank with a screen top? If so put the heat lamp on the warm side of the screen and cover the remaining with a towel for now. The best way is to use aluminum tape and cover the screen with that. That will get your temps up and help hold in some humidity. Put a water bowl as close to the warm side as well to raise the humidity. You should only need one bulb after doing this unless your house is extremely cold. Most importantly, make sure you have a thermostat for the heat mat.