I have an outside light that is controlled by a light switch inside. I took the light out and put a adapter to plug in an extension cord to run LED Christmas lights. When I turn the switch off, just the first strand of lights glows very faintly so I wonder is my switch used as the ground and the lights are finding ground at the tree they are hung at.
Electrical – Why do the LED Christmas lights glow when plugged into a light fixture via an adapter
electricallighting
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Best Answer
If the switch is a dimmer, remote operated switch, or a switch with a neon backlight, it may allow a small amount of leakage power even when off. It's not enough power to light an incandescent light, but it may be enough to dimly light led lights.