Everything I've read recommends using identical hides one for hot side and one for cold, also make sure your ambient air temps don't get too low (uth don't heat up the air just the substrate) I'm thinking nothing below 75 but not 100% sure, also night time temp drops aren't recommended so if that lamp is helping to heat during the day and off at night you will get temp drops, but I see the heater, you might just switch the light out for an infrared heat bulb zoo med makes a good one and run it 24/7 for your ambient temps just monitor them, you might want to use a rheostat with it