I use all visions, I get the larger models that have the drop down lamp. I please heat tape on a dimmer under the bottom unit. The bottom unit I build a base out of 2x4 and plywood so its not sitting directly on the floor and place its either 12 or 18 inch heat tape under the hot side the rest I use ceramic heat bulbs in the drop down fixtures and place them on dimmers as well. Then maintain the room temp. I use the 432 models 54inchx36x18 high. contact Russ at rlreptiles.com he can get ya squared away set up properly. Only thing is if you stack visions 3 or 4 high dont use regular light bulbs thats the only downfall to visions is you have to move the whole stack if the bottom bulb goes.
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Jason & Danica
Classic Dums frozen feeders