I didn't get that part, maybe I didn't read it? Ooops.
So he must have a bayonet fitting?
I thought they were illegal nowadays, no?
(I went to Bunnings the other day with and old bayonet bulb I found in my garage and I was told so)
Nonetheless, a ceramic batten holder (w/ Edison fitting and mounting bracket) for $10 and a IR bulb for $8 may lessen the stress and headache?
So, the existing fitting for white light and by mounting another to roof of enclosure for IR/heat source.
That's how I've done for my bluey.
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