That will give you a very poor temp gradient. I would guess much less then 10 degrees from the cool side to the hot side. The whole shelf is just going to heat up. Ideally I would place a square of flexwat on each shelf and connect each of the engs to the one above and below so that each piece is on one circuit. You can see a pic of what I'm talking about at clay davenports website when he builds a large iris tub rack. You could even just put each shelf on its own plug. This gives very nice control. Many racks get warmer then you want at the top and too cool at the bottom. (Some people plan for this and put hotter species up top.) This way you can plug them in to a thermostat individually or in groups via a power strip.



What species are you keeping? If they are not to crazy about very high heat, you could use 4 inch flexwatt on the back. The 4 inch is a werd size you can get it from MG reptiles. It woul not be supper powerful but if your room isnt too cold it should be fine.



-cheers

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