The Emisar lamps with the v2 UI has to my knowledge two D-parts in seriel.
The problem is the thermic loop is f… slow and the sensor is in the µC.
You should really ask Toykeeper (often TK for short) in the Emisar D4 thread about this. She had a few simulations running to get the settings right. It should be on the first 40 pages, I guess.
What other companies like Nitecore do when they print thermal regulation on the box, I really don’t know.