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G'day Bungeye,
If it is a pulse thermostat, i would recommend that you dont use incandecant bulbs in it simply because you will find that you will be replacing the bulbs every week. So probably best to change over to a edison fixture and use a non light emitting heat source, like a ceramic. I havent seen any ceramic heat emitters in a bayonet fitting.
You really do need a thermometer, ideally, you would want one at the top and one at the bottom. This way you know exactly what the thermal gradient is like. I have never found a thermostat that is accurate to temperature. Therefore it is best to use a thermometer to calibrate exactly the temps that you need.
Your other alternative is you could use floor heating, but if it is a tall enclosure, it sort of defeats the purpose of having a tall enclosure. But it is totally up to you.
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