Wall outlet timer

Depends on a couple things. The type of timer. Some fully sever the circuit, some still allow a tiny bit of electricity through. If it fully severs the circuit this is a defective diode - something to do with the phosphor layer, if i recall. Easy way to tell. When it happens, unplug it.. if the diodes then shut off, you know you have the timer that doesn't physically sever the circuit I had some cheap COB LED before. One of the units would glow like that for 30 minutes after lights out. Even if unplugged - a testament to the efficacy of LED, even the shitty no name brands, lol. anyway, if they glow even for long periods after you unbplug it, that's a manufacturer's defect and should be covered by the warranty and any self-respecting brand. if it's the fault of the power timer, then obviously you just need a new timer.

If it fades quickly after shutoff, it's likely just leftover energy in the driver. If it stays on longer, switch to a quality relay-based timer to ensure full blackout.

Also ich weiss nicht ob das bei dir hilft. Aber als ich das Problem hat, habe ich nur de. Stecker in der Steckdose einmal um 180grad gedreht dan war das Problem weg. Versuche es mal

Yep, had that exact issue once, some cheap timer left a tiny current running and my LEDs kept faintly glowing at night. Didn’t notice right away and ended up with seeded buds. Swapped to a better timer with full cutoff and it never happened again. If you see even the faintest glow, fix it fast, it can absolutely mess with your girls during flower, unless it's an autoflowering strain. Good luck growmie🤞🍀♥️