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The cheap Chinese bulb that won't turn off
Why people recommend it
Explains why cheap LED bulbs glow faintly when switched off, tracing it to capacitive coupling in long cable runs; it explains the cause but offers no fix.
Watch for: the driver PCB at 8:11
In their words
This video by steeve mould tried to explain what is going on but did not offer a solution on how to fix the issue.
DrakeJest on electronics.stackexchange.com, Feb 2022. CC BY-SA.
The problem you're encountering is typically caused by capacitive coupling in elongated cable runs (for a detailed explanation, refer to this video: [video]).
15 Volts on electronics.stackexchange.com, Jul 2023. CC BY-SA.
