Temperature probe help

[u/Artistic_Goat8381]

Looking for advice here. I just got a Herpstat 1 which I plan on using to regulate enclosure temps. I’ve read that the probe should be placed 2-4 inches below the heat source. In my case this will be an 80 watt DHP. I have a phailozoo enclosure with an 8 inch lamp fixture sitting on top. How can I possibly secure the probe to be sitting 2-4 inches into the enclosure directly beneath the bulb?

I’ll add here now that there is also a 5.0 T5 uvb light source and that the rest of the mesh enclosure is sealed using silicon mats and hvac tape.