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Long story short: Its the wiring.

Could be a number of reasons but the most common is either its wired to a dimmer or similar which is leaking some current when its "switched off" or its switched on the netural side and the wiring is acting as a capacitor and letting some current flow.

EDIT: https://www.youtube.com/watch?v=_bgUy6zA0ts



Short story longer: if the led is connected to a dimmer, it can also be that the led is not-dimmable. Or not compatible with the dimmer.


I've got dimmable LEDs on a non-dimmable switch that are glowing. I guess the next step would be to replace the switch with a dimmable one...




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