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- Even when a LED lamp is completely disconnected on one side, it can still glow. If the switch is situated between the neutral line of mains and the lamp, there will be a 60Hz voltage difference between the conductive parts of your fixture and the surroundings. These surroundings have a potential (earth) close to the neutral line of your mains supply. There is a small parasitic capacitance between the wires of the lamp and the surroundings. This will conduct a small current. This current will not flow through the return line of your mains, and is not detected by a Watt-O-meter. A LED lamps needs very little current to start emmiting light , a current of 100uA can already be visible in dark conditions.
Possible solutions:
- Set the switch in the other Phase of mains.
- Use a double pole switch and disconnect both phase and neutral.
- Attach a small load parallel over the LED lamp. A 100K resistor might do the Job .
Warning: Do not modify your electric wiring unless you are both skilled and qualified for this !
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