Chris, that's exactly what got me thinking, and I think we are talking about the same company, they make a "uromastyx" or bearded dragon enclosure.

I posed this question on another forum and apparently that company had the ceiling-melting problem as well, and had to send out a spacer like mark mentioned in his response below.

I guess that's why people have more success with the screen-hole-cutout-with-lamp-over-it scenario.

Thanks for your reply, I will keep at this and see what I come up with. I'm a few months out, but I'll eventually post results.

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