Lennycorn is right about the temps (at substrate level), but you should try to achieve the warm-side temps with the UTH alone, and ditch the lamp. Lamps dry out a viv considerably, and low humidity causes problems. If you want the lamp for lighting, use a fluorescent bulb that gives off very little heat. Place a towel over the other side of the screen top to retain humidity. Water bowl size and placement can also be used to regulate humidity. Good luck.