Why do lights dim or flicker even after being turned off? This problem troubles many people. What exactly is going on? How can it be solved?
1. The switch controls the neutral wire. This is a common problem. The electrician may have misconnected the neutral wire to the switch during wiring, or the neutral and live wires were reversed when the wiring was connected to the electrical box. The switch controls the neutral wire, but the live wire is still connected to the light, causing a dim glow.
Solution: Adjust the wiring so that the switch controls the live wire.
2. The double-control switch is incorrectly connected. Double-control switches can be connected in several ways. If the incorrect connection is used, the light may dim after being turned off.
Solution: Install the correct live wire connection and rewire.
3. The switch has an indicator light. If an electronic switch is used, a slight current will flow after the light is turned off.
If the light uses an electronic switch, such as an infrared, voice-activated, or remote-controlled switch, the dim glow phenomenon may also occur after the light is turned off.
Solution 1: Replace the switch.
Solution 2: Connect a 500K resistor in parallel with the lamp's power supply. However, this method requires high technical skills and is difficult for non-professionals to perform. It is also ineffective for dimming caused by live neutral wires or leakage from SMDs.
4. Non-isolated Driver, Leakage Between the Light Source SMD and Substrate
Many lamps use low-quality RC step-down drivers for cost reasons, or the light source SMDs are of poor quality, resulting in leakage between the SMD and substrate. The substrate copper and capacitance effects can also cause light leakage. This is why some lamps in a room may be on while others are off.
Solution: Replace the lamps with fully lit, isolated driver power supplies.
5. Live Neutral Wire
A live neutral wire is the root cause of dimming after turning off the light. If the switch controls the live wire and the light still appears even with a standard wall switch, the neutral wire is live. Live neutral wire is a common phenomenon. Causes of live neutral wire include poor neutral grounding, unbalanced load on the three-phase transformer, long or thin wires, or excessive neutral current.
Solution: Re-ground the neutral wire or perform a low-voltage modification.
6. Lamp Protector
Finally, I recommend a simple and effective solution: a lamp protector. This can completely eliminate various causes of dimming. Connect the protector to the lamp and, when the light is turned off, disconnect it from the mains. Even if the neutral wire is live, the chip is leaking, or the switch is connected incorrectly, no current will be conducted to the lamp.
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