LED lights flickering when they're dimmed? Dimmer and downlight compatibility is the single most common cause of flickering we see.

Old leading-edge dimmers were engineered for high-wattage halogen and incandescent loads. LEDs are low-wattage electronic loads, and the two don't always play nicely. Using an old halogen dimmer can cause LED globes to flicker, shimmer at low dim levels, or fail early. LEDs generally need a trailing-edge or adaptive LED dimmer.

Ideally, use an LED dimmer that has been tested with your downlights – and where possible, the same brand. This prevents compatibility issues and gives you a single supplier to go back to if something isn't right.

We've reviewed a number of dimmers in our guide to the best LED dimmers. Our pick is the MEDM by Diginet – an adaptive-phase dimmer that's so capable it will even smoothly dim some products rated as non-dimmable. Quality dimmers are an investment; cheap ones usually cost you more in replaced globes and call-outs down the track.

If you need help choosing the right dimmer (or light and dimmer combination), we're happy to help.

A note on traditional dimmers: older bulbs had "persistence" – the filament kept glowing between the dimmer's rapid on/off cycles, producing a smooth dimmed effect. LEDs have no persistence; they stop emitting light the instant current stops. That's why dimmers designed for older types of bulbs often make LEDs flicker when dimmed.

The fix: replace old halogen dimmers with a quality trailing-edge or adaptive LED dimmer that's been compatibility-tested with your downlights.

Dimmable LED globes work fine in a standard, non-dimmed socket (it just defeats the purpose of paying for dimmable lighting products). The reverse is not true.

Non-dimmable LED bulbs installed on a dimmer circuit are likely to flicker, strobe and even hum at anything below 100% brightness. Every flicker also stresses the internal driver, so the globe's lifespan shrinks each time it's dimmed.

The fix: check the globe's packaging or product page. If it isn't marked dimmable, either swap it for a dimmable version or replace the dimmer with a standard switch.

Many dimmers – especially older ones – need a minimum wattage on the circuit before they can dim smoothly (often 20–40W). Halogens met this easily, but a couple of 5–9W LED downlights may not, which causes flickering or jumping at the low end of the dimming range.

The fix: use an LED-specific dimmer with a very low (or no) minimum load, such as an adaptive-phase model. If you've recently swapped halogens for LEDs on an old dimmer, this is a likely culprit.

Every LED light has a driver – a small power supply that converts your home's 230V AC into the steady low-voltage DC the LED chips need. The driver is the hardest-working part of the fitting, and it's usually the first thing to fail, particularly in enclosed fittings where heat builds up.

As the capacitors inside a driver degrade, it can no longer hold a perfectly steady current, and the light begins to flicker – often getting gradually worse over weeks or months.

The fix: for downlights with a separate plug-in driver, the driver can simply be replaced. For integrated fittings, the unit is usually replaced as a whole. If a fitting is still under warranty, contact the supplier – flickering from driver failure is a legitimate warranty claim.

LEDs don't blow like halogens. Instead, they degrade – and flickering, dimming or colour shift are the classic end-of-life signs. Budget globes with low-grade drivers get there much faster, sometimes within a year or two.

The fix: if a single globe flickers in any socket you try it in, it's done – replace it. Buying quality globes from a supplier that backs them with a genuine warranty costs slightly more upfront and far less over time.

Sometimes flickering is a simple case of a loosely fitted globe. The socket isn't making full contact with the bulb, so even slight movement or vibration causes intermittent flickering. Note that LED downlights (recessed lights) can also work loose over time.

The fix: switch the light off, let it cool, and screw the globe in firmly – gently, as excessive force can crack the lamp. For downlights, check the globe is seated properly in its holder and the plug-in connector to the driver is firm.

Over time, dust settles on LED bulbs and creeps into the socket, interfering with the contact between globe and holder. If your fittings haven't been cleaned in a long time, dirt may be behind the flicker.

The fix: turn the power off at the switch (or the circuit at the switchboard for hardwired fittings), unscrew the globe and clean the socket with a dry brush or cloth before refitting. Never clean a live socket.

A large share of Australian housing stock dates back to the 1980s and earlier, and older homes commonly develop electrical issues – loose terminals at switches and lampholders, ageing junctions, or in the worst case a deteriorating neutral connection.

If cleaning sockets and securing globes hasn't fixed the flicker – and especially if lights flicker across the whole house, or you notice buzzing, warm switch plates or tripping breakers – stop troubleshooting and call a licensed electrician. Loose wiring is a genuine fire risk, and in Australia all fixed wiring work must legally be done by a licensed electrician anyway.

The fix: a licensed electrician can test and tighten connections, and check whether the fault is inside your home or on the supply side (your distributor's responsibility).

Do your LED bulbs flicker whenever a high-wattage appliance kicks in – the air conditioner, oven, heater, or washing machine? That's inrush current: the surge of energy an appliance draws in the moment it switches on, which briefly pulls down the voltage on the circuit.

Because LED lights are up to 75% more energy-efficient than old halogens, they're sensitive to even small voltage dips – so they blink when the fridge compressor starts.

If it happens constantly, your circuits may simply be overloaded: the appliances on the circuit are demanding more than it can comfortably supply. This tends to get worse as households add more appliances over time.

The fix: where possible, keep high-draw appliances on their own circuits. If flickering with appliance use is frequent, have an electrician assess whether your switchboard and circuits need upgrading – this also removes a safety risk.

If your LED lights flicker at roughly the same time every evening, this is probably your answer – and it's the cause most overseas guides miss entirely.

Electricity distributors across Australia – especially in NSW and Queensland – use "ripple control": a high-frequency signal injected into the mains to remotely switch off-peak hot water systems and manage peak demand. Most equipment ignores the signal, but some LED drivers pick it up as noise, producing a rhythmic flicker or shimmer while the signal is being sent (commonly in the evening peak, around 5pm–10pm).

Because the signal comes from the network, no amount of globe-swapping will make it go away on its own.

The fix: an electrician can install a ripple signal filter at your switchboard, which blocks the signal from reaching your lighting circuits. Choosing lights with higher-quality drivers also makes a big difference, as good drivers filter the signal out themselves. And if you'd like some lighting that's immune to grid quirks altogether, solar lights run entirely off the grid.

Most flickering is harmless and fixable yourself by changing a globe or upgrading a dimmer. But call a licensed electrician promptly if:

• lights flicker throughout the whole house, not just one room or fitting;
• flickering is accompanied by buzzing, burning smells, or switches and dimmers that feel warm;
• circuit breakers trip alongside the flickering; or
• the flickering started after electrical work, a storm, or damage to the property.

These symptoms can point to loose wiring or a failing neutral connection, which are fire and shock risks – not DIY territory.

Are flickering LED lights dangerous?

Usually no – a single flickering LED is most often a dimmer compatibility issue or a globe reaching end of life. However, flickering across the whole house, or flickering combined with buzzing, burning smells or warm switches, can indicate loose wiring or a failing neutral connection. That is a fire risk and should be checked by a licensed electrician promptly.

What does it mean when my LED lights flicker?

Flickering means the current reaching the LED chips isn't steady. The cause is usually one of three things: the control side (an incompatible dimmer or smart switch), the light itself (a failing driver or ageing globe), or the supply (loose connections, voltage dips from appliances, or ripple control signals on the Australian grid).

Do LED lights flicker before they burn out?

Often, yes. LEDs rarely fail suddenly like halogen globes. As the driver's internal components degrade, the light typically flickers, dims or shifts colour before it dies completely. If a globe flickers in every socket you try it in, it's at end of life – replace it.

How do I stop my LED lights flickering when dimmed?

First confirm your globes are actually dimmable. If they are, the dimmer is almost certainly the issue: replace old leading-edge halogen dimmers with a trailing-edge or adaptive LED dimmer, ideally one compatibility-tested with your downlights. An adaptive-phase dimmer like the Diginet MEDM solves the vast majority of dimming flicker we see.

Why do my LED lights flicker at the same time every night?

That's the classic signature of ripple control. Australian electricity distributors inject a high-frequency signal into the grid during peak periods to control off-peak hot water, and some LED drivers pick it up as flicker. A ripple signal filter installed at your switchboard fixes it, and higher-quality LED drivers are far less susceptible.

Why do my LED strip lights flicker?

LED strip flicker is usually caused by an undersized or failing power supply, a loose connection between the strip and its driver, or voltage drop along long runs. Check the transformer's wattage exceeds the strip's total draw by at least 20%, reseat the connections, and for long runs feed power from both ends.

LED lights have an impressive lifespan – 25 to 50 times longer than incandescent bulbs and 5 to 10 times longer than halogen. But every hour spent flickering stresses the driver and cuts that life short. Find the cause, fix it early, and your LEDs will reward you with years of steady light.

Still stuck? Give us a ring or drop us a message – we troubleshoot flickering lights for customers every week and we're happy to help you find the right globe, downlight or dimmer combination.