Light: I’d go with whatever you personally prefer as that’s what matters most. If it were mine I’d probably put it at the back.
Unrelated to your light, that is an ENORMOUS RHP for that size enclosure. 80watt it looks like based on the size? I’d shoot for the 40watt. I personally use that same 80 watt RHP for enclosures that are over twice that size.
Reason being is that you’re going to have one helluva time establishing a temp gradient when the heating element covers the majority of the enclosure.
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