Its a Reptile Basics rack. The whole piece of flexwatt is about 8.5 feet in length, and I believe 10 watts per foot. So the total wattage is around 85.
There is a slight difference between the top and bottom levels in regards to temperature. I don't know if its necessarily caused by a difference in the heat tape. I think its caused more by the fact that the bottom of the rack is directly on the ground. I have seen people make a small platform to put the rack on alleviating some of the cooling.
http://www.reptilebasics.com/
With the multiple pieces of flexwatt there is a chance it may malfunction, but you can use a back up thermostat just in case the first one fails.
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