I understand at least one company selling PVC cages is now including some sort of nylon spacer on the ceiling to prevent melting of the PVC.

I don't forsee building any plastic cages for diurnal, sun-loving lizards but if I did I would use some sort of barrier between the fixture and the plastic. Maybe something as simple as a couple of layers of cement board or tile backer.
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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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