ok, you need to get an Infrared heat bulb then, they can and should be left on 24/7... if the temperatures drop too low your BP can get very sick.

What about the heating pad? does it have a thermostat? and what type of thermometers are you using?> these are very important questions... without a thermostat a heating pad can get hot enough to kill your snake within a week... and if you don't have probed digital thermometers you will have no way of monitoring it's temperature.