That's one of them. There was another company making PVCX cages that I think catered to the Bearded Dragon crowd, being breeders of that species as well as cage builders.

I think it can be done, you'll just need to take your time and run tests to see how things are working.

I like Mark's suggestion of a thermal mass source on the ceiling. You could also build a shallow plywood box that attaches to the ceiling and attach your fixture to that. Leave just enough room to fit in some radiant barrer insulation.

Adding thermal mass directly below the basking area also helps a lot. But then you have the additional problem of the PVCX cages being able to handle all the extra weight.
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Currently keeping:

6.10 Gonyosoma oxycephalum (Javan, mixed colors)

0.0.4 Rhynchophis boulengeri

1.1 Philodryas baroni

1.1 Lampropeltis triangulum multistriata

0.0.1 Rhamphiophis rubropunctatus

0.0.2 Morelia viridis (Aru & Merauke locale types)

1.0 Rhodesian Ridgeback

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