Thank you BanL! 
Is there any way to reach you besides of this thread? I have some technical questions concerning your H1-A and H2-C drivers (mostly about tweaking them with alternative resistors to run them with 12V LEDs like XHP35). I also sent you private messages before but did not get any response so far. I also started a new thread that I would like to invite you to: WTB: XHP35 20mm Boost Driver (improvements of Kaidomain H1-A)
It would be great if you were to help me as these tweaks might be beneficial for Kaidomain, selling a high performance XHP35 boost driver for flashlights like the brandnew Convoy S11 or Convoy L2 or your own KD-brand flashlights, of course.
Cheers, Thomas