why does the light bulb glow after I turn it off

Question

(It was on for an hour)

In: 2

Answer 1

If it is a LED bulb, it may receive enough energy to glow dimly continuously through capacitive coupling when its wire is in proximity to another energized wire, similarly how an electrician’s screwdriver works only touching one end. This is more likely to happen if the switch is wired incorrectly to interrupt the ground wire. If you see bare LEDs, their phoshor may glow for couple dozen seconds because its purpose is to re-emit recieved light in another color, and it continues to do so very faintly.