Got the FT03 SST-40 5000 K today! Charged the battery, switched it on in turbo, got a short flicker for less than a second and now the LED is dead. Just a very dim glow when it is switched on. The backlight LED of the switch works fine and the switch behaves normal. It’s just the dead SST-40 (but why does it still glow?). Probably bad product design and just too much current for this LED.
Well, Banggood customer support again, yay.