In this video, I am sharing a very common problem related to LED bulbs these days.
The problem is that the LED bulb continues to glow even after the switch is turned off.
To explain this issue, I have added a YouTube video below. Please watch it for a complete explanation.
Nowadays, we often see that low-wattage LED bulbs keep glowing even after the switch is turned OFF.
This mostly happens in capacitive dropper–type LED bulbs, which use very cheap power supply circuits.
So, do we really know why this happens?
Let’s understand the main reasons behind it.
Here are the possible reasons:
1️⃣ Wrong switch connection – Sometimes the switch is connected to the neutral wire instead of the phase wire.
2️⃣ Induced voltage or phantom voltage – This is the main reason. Nearby live wires induce a small voltage in the OFF wire.
3️⃣ Leakage current in wiring – Due to old or damaged wiring.
4️⃣ Poor-quality LED driver – Cheap LED bulbs are more sensitive to small voltages.
Practical solutions:
✅ Always connect the switch to the phase wire only.
✅ Use good-quality, branded LED bulbs.
✅ Ensure proper earthing and get the wiring checked.
✅ Install a bleeder resistor (100kΩ–220kΩ, 1 watt) across the bulb holder.
Finally, there is no need to worry too much about this issue, especially with cheap low-wattage LED bulbs below 9 watts.