Yeah, that is tougher. Here is the theory that can work:

You don't bolt the lamp fixture to the cage top. Instead you mount it to a heat sink, then mount the heatsink to the cage ceiling. Aluminum makes a great heat sink.

Here is what I have done in the past:
I've done it with 50 watt bulbs in plastic cages (for snakes). Now I have fewer snakes, do community cages and use RHPs exclusively.

I purchased a ceramic single lamp fixture (the kind you find in an aquarium fixture for example), covered the exposed contacts with epoxy putty, and glued (epoxy) a piece of extruded aluminum (1/8 inch thick by 1 inch wide by 8 inches long) to the top of the fixture. I bolted the assembly to the top of the cage using spacers to separate the aluminum bar from the plastic.

The aluminum bar provides a great heat sink for the fixture. Most of the heat went there instead of the cage top. For a 50 watt bulb, no problem. This setup worked on HDPE which has a very low melting point, lower than PVC I believe.


>>Hi Mark,
>>
>>Sorry I should have specified that I am looking to stack these enclosures, I have several terrestrial, diurnal lizards. As such the fixtures would be located inside the enclosure.
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Mark

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