Light Still On When Power Is Off
If an LED light remains glowing after it has been switched off it is not a faulty light fitting.
Like any other bulb electric current must still be supplied to the LED to make it light up,
The usual problem is the live wire between two way switches being run alongside the LED supply circuit. The AC in the live wire will induce a current in the nearby conductors.
The cure is to relocate the live wire, though best option is to think of this when planning the wiring.