LED Lights Flickering

What is this?

LED flickering is one of the most common lighting complaints in UK homes, especially after upgrading from halogen or incandescent bulbs. LEDs work very differently from traditional bulbs — they are sensitive to the quality of their power supply, dimmer compatibility, and even the design of the LED driver inside the bulb. Most LED flickering is annoying rather than dangerous.

Common causes

• Incompatible dimmer switch — most older dimmers are designed for higher-wattage incandescent bulbs and do not work properly with LEDs
• Cheap or poor-quality LED bulbs with inadequate internal drivers
• LED bulb not rated as dimmable being used on a dimmer circuit
• Loose connection at the bulb, fitting, or ceiling rose
• Electrical interference from other devices on the circuit
• LED driver reaching end of life or overheating

Is it dangerous?

LED flickering is almost always a compatibility or quality issue rather than a dangerous fault. However, if the flickering is accompanied by a burning smell, buzzing from the fitting, or the bulb or fitting feels excessively hot, there may be a wiring issue that needs checking.

Can I fix it myself?

First, try replacing the LED bulb with a reputable brand — cheap LEDs are a common cause. Check that dimmable LEDs are installed if you have a dimmer switch. If you recently changed from halogen to LED, your dimmer switch almost certainly needs upgrading to an LED-compatible (trailing-edge) dimmer. Also ensure the bulb is properly seated in the fitting.

When to call an electrician

Call an electrician if replacing the bulb does not fix the flickering, if you need a new LED-compatible dimmer switch installed, if multiple LED fittings on the same circuit are flickering, or if the flickering started without any changes to bulbs or fittings.

What will an electrician do?

Typical cost