You right. Fenix use CC buck driver but I need to compare XML2 vs SST40 if they are more efficient and powerful for same current.
Hi I have a simple MOD of remote switch time ago but need to assemble it and test it. Also I make some prototype PCBs. The idea is very simple. As you I also hate to press button all time for turbo. I have made simple circuit with 555 timer when I press the button to have like 5 sec ON time of output or more. I can adjust ON time with trimmer potentioemeter.
Bort see here: Opple Light Master III (G3) discussion thread (Cheap device for measuring Lux, CCT + CRI)