As mentioned above an RHP is best to heat a T8. For a T8 an 80w from reptile basics will work or you can contact pro products and they will tell you which size to buy from them, I use both companies and both are great. Another thing that is good about the rhp is that it will heat the whole cage and give a proper gradient. You would install it either on the left or right side of the cage (only 2 screws to install) and then set your thermostat so the ground temp under it is around 90 and the heat will also radiat to the cool side making it around 80. Bonus is you only need 1 thermostat with the rhp rather then having to buy 2 for a heating device on each side.
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