Thanks bitsy, I was told that last night on the chat...I will be changing the system soon, maybe on the wekeend, as for now he will have to have some light rays, I am new at this and just spent a wack on getting set up, unfortunately I was misled...thanks again.
Does your lamp have a dimmer? Are you pumping 150 watts all the time during the day? If you can't change the intensity of your primary light, I would try to find a way of moving it farther from the tank until you are able to switch to a UTH and thermostat. The farther away the light is, the less heat it will transfer to the cage.
Reaching 90 degrees in there is a sign that things are too hot. I know that the technical limit is 90 degrees, but I fear that even getting as high as 90 degrees means that other parts which you aren't monitoring may be getting over 90 degrees.
Out of curiosity, what is your room temperature and tank size?