New IRF520 mosfet module operational range is 0-100V …
… all my other IRF520 modules had 0.24V only. So I needed to use two of them in series to control 5000lm led via its 38V/1.5A power supply.
The new can do all this alone, script used in the video:
$ sudo pigpiod
$ pigs pfs 17 100000
8000
$ while true; do for((v=1;v＜=255;++v)); do pigs p 17 $v; done; for((v=254;v＞=0;--v)); do pigs p 17 $v; done; done