After mining/deconstructing either type of heating tower the radiative-tower-lamp underneath is not being destroyed. It does need to be fueled/heated first to generate the lamp.
It's very hard to notice since the lamp is invisible and unselectable unless you manage to hover over the exact tile in the editor, while on the entitites tab, and without anything in the cursor. I only noticed this due to accidentality editing the collision layers of the radiative-tower-lamps and was having issues placing things.

While I haven't seen this cause any issues so far, I thought I should report it because it seems the kind of thing that could cause some really weird bugs.

I did replicate this on a clean save with only this mod installed to make sure it wasn't some weird mod interaction.