How do you solve residual luminescence in LED bulbs?

The phenomenon of residual or persistent luminescence (also known as "ghosting") occurs when LED bulbs remain dimly lit even after the switch has been turned off. This problem has identifiable technical causes and specific solutions depending on the type of installation.

According to sources, these are the ways to fix it:

1. Checking the Phase and Neutral on the Switch

The most common cause is that the switch is cutting the neutral wire instead of the phase wire, allowing a small amount of current to reach the LED.

• Solution: The electrical installation must be checked to ensure that the switch always cuts the current in the phase wire, as required by current regulations.

2. Installing a Capacitor or Flicker-Proof Device

In many cases, the problem persists due to induction in the wiring or the use of pilot light switches (those small neon lights that glow in the dark to locate the switch), which allow sufficient residual current to pass through to activate the LED.

• Solution: Install an anti-flicker capacitor or module in the circuit. This is an inexpensive and simple to install element that absorbs that small excess energy, allowing the LED to turn off completely.

3. Solution for portable (plug-in) lamps

If residual brightness occurs in a lamp that plugs directly into an outlet using a plug, the solution is much simpler.

• Solution: The cable must be unplugged and reconnected with the pins in the reverse position (turn the plug 180 degrees) to correct the polarity of the connection.

4. Replacement of incompatible components

Sometimes, luminescence or flickering is due to old dimmers being used that are not designed for LED technology.

• Solution: If the installation is dimmable, the old dimmer must be replaced with a special dimmer for LED bulbs.

Metaphor to understand the concept: Residual luminescence is like a faucet that has a tiny water leak: even if you have turned it off, the pressure in the pipe (the residual current or induction) is enough to keep droplets falling. Installing an anti-flicker capacitor is like placing an absorbent plug that retains those droplets of energy so that the "container" (the LED) never fills or glows.