RobertsKitty, you don't have to run a herpstat 4 there are thousands of Hydrofarms/Zillas keeping reptiles regulated world wide.
Personally I would run about 18" of 11" along the back so you would have about 9x11" on each side.
Just keep in mind that heat tape doesn't really do much for ambient temps.
The lighting you want to use might help from the heat off the ballast but I don't know how much it will raise the temp.
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