Finally, I have collected 4 flashlights for underwater hunting:
SCORPENA C
FEREI W158II
DESNA (Aquamaster)
MAGICSHINE 810ES
I suggest testing these flashlights according to 3 main criteria:
glow duration,
"penetration ability" in muddy water,
ergonomics.
P.S.: If you have any other suggestions on what parameters of the flashlights should be tested, write in the Comments.