Is a flickering LED bulb dangerous?

Occasional flicker is usually a compatibility issue rather than a hazard, but persistent flickering can point to a loose connection or an ageing dimmer. If it continues after trying a dimmable, LED-compatible bulb, have a licensed electrician check the fitting and switch.

Do all LED bulbs flicker?

No. A good-quality dimmable LED on an LED-compatible dimmer should not flicker. Flicker almost always comes from a mismatch between the bulb, the dimmer, or (for low-voltage spotlights) the transformer.

Last updated: 19 August 2026

Why do LED bulbs flicker?

Flickering is one of the most common LED complaints, and it almost always comes down to a mismatch — between the bulb, the dimmer switch, or the transformer feeding a low-voltage spotlight. The good news is that the cause is usually easy to pin down.

The usual causes

A non-dimmable LED on a dimmer. The most common one. Non-dimmable LEDs aren't designed to handle a dimmer's chopped power and will flicker, buzz or refuse to dim.
An old dimmer switch. Dimmers built for incandescent bulbs often can't smoothly control the tiny power an LED draws.
A low-voltage MR16 transformer. Older transformers may not be rated for LEDs and can cause flicker.
A loose connection in the fitting or a very cheap bulb driver.

How to fix it

Start with the part you can safely do yourself: fit a bulb clearly labelled "dimmable" if it's on a dimmer. That alone solves many cases. If flicker continues, the switch or transformer is the likely culprit — and replacing a dimmer, or fitting an LED-rated driver, is electrical work that a licensed electrician should carry out (in Australia, unlicensed electrical work is illegal). An electrician can fit a modern LED-compatible (trailing-edge) dimmer that dims smoothly.

Check your setup first

Not sure whether your bulb, dimmer and fitting are a good match? Our dimmer compatibility checker flags the risk and the fix in a few taps. If the bulb also looks wrong in other ways, try Fix My Bad Bulb.