Interesting - I have never heard of heat backup with a CHE bulb. I was under the impression as long as the socket was made of ceramic this would be considered an appropriate dome to use with a CHE.
I took a closer look at my dome and it does have 3 holes towards the top, I assume to prevent excessive heat build up.
The suggestion I gave was based on the OP's concern of the durability of the heat bulb they were using. You do bring up some good points about the fixture though, want to make sure you have a fixture that is designed for a CHE.
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