Radiant heat panel positioning

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I am in the process of building a bioactive 4x2x2 PVC enclosure for my ball python and want to use a RHP. I talked with Pro Products and was recommended a panel that is 12inx22in. My question is in order to fit the light bars I want to use I would have to mount the panel length wise such that it would stretch half of the enclosure. If i position it this way would I still be able to achieve a proper temperature gradient or will the RHP push to much heat even to the other half of the enclosure?

I think you'll be o.k. RHPs do a great job of creating a hot spot directly beneath them. They don't raise the ambient temperature very much. You should run your plan by the folks at Pro Products though. They're the experts.