# Why do my LED downlights flicker or buzz? 1. [Home](https://arlite.co/) 2. [Support](https://arlite.co/support/) 3. [Electrical](https://arlite.co/support/electrical/) 4. Why do my LED downlights flicker or buzz? **Browse support** [Support home](https://arlite.co/support/) [Solar](https://arlite.co/support/solar/)[View all](https://arlite.co/support/solar/) - [How does a solar power system work in a Brisbane home?](https://arlite.co/support/solar/how-does-a-solar-power-system-work-in-a-brisbane-home/) - [How do I turn off a solar inverter safely?](https://arlite.co/support/solar/turn-off-solar-inverter-safely/) - [Do solar panels work during a blackout?](https://arlite.co/support/solar/solar-during-power-outage/) - [Can I add a battery to my existing solar system?](https://arlite.co/support/solar/add-battery-to-existing-solar-system/) - [Hail or storm damage to solar panels: what to do](https://arlite.co/support/solar/hail-storm-damaged-solar-panels-what-to-do/) [Air conditioning](https://arlite.co/support/air-conditioning/)[View all](https://arlite.co/support/air-conditioning/) - [Why is my air conditioner not cooling or heating properly?](https://arlite.co/support/air-conditioning/air-conditioner-not-cooling-or-heating/) - [Why is my air conditioner leaking water inside?](https://arlite.co/support/air-conditioning/air-conditioner-leaking-water-inside/) - [Why does my air conditioner smell musty or like dirty socks?](https://arlite.co/support/air-conditioning/air-conditioner-smells-musty-dirty-socks/) - [Can solar panels run my air conditioner at night?](https://arlite.co/support/air-conditioning/can-solar-panels-run-my-air-conditioner/) - [What should I ask before getting an air conditioner installed?](https://arlite.co/support/air-conditioning/questions-to-ask-before-air-conditioner-installation/) [Electrical](https://arlite.co/support/electrical/)[View all](https://arlite.co/support/electrical/) - [Why do my LED downlights flicker or buzz?](https://arlite.co/support/electrical/led-downlights-flickering/) - [Why does my circuit breaker keep tripping?](https://arlite.co/support/electrical/circuit-breaker-keeps-tripping/) - [Why does my safety switch keep tripping?](https://arlite.co/support/electrical/safety-switch-keeps-tripping/) - [Burning smell or hot power point: what to do right now](https://arlite.co/support/electrical/burning-smell-hot-power-point/) - [Why is there no hot water? 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By Casey Midgley, Arlite Energy Last reviewed 30 October 2026 4 minute read **No DIY.** Electrical work must be done by a licensed electrician. Never open, repair, test or modify electrical equipment yourself, even if it looks simple. This guide explains what is happening; it is not a how-to. **On this page** 1. Why do LED downlights flicker or buzz? 2. Which parts can be the problem? 3. What about heat in the ceiling? 4. Is this a DIY fix? 5. How does an electrician work out which part is at fault? 6. What to note before you call about flickering downlights 7. Frequently asked questions LED downlights usually flicker or buzz because the LED lamp, the transformer or driver behind it, and the dimmer do not suit each other. The fix is often a matching driver, a compatible dimmer or a new fitting. That is wiring work, so in Queensland it must be done by a licensed electrician. ## Why do LED downlights flicker or buzz? Older halogen downlights run on a transformer designed for a particular kind of lamp. LED lamps draw far less power and behave differently. When an LED lamp is paired with an old halogen transformer, or controlled by a dimmer made for old-style lamps, the result can be flicker, buzzing, dimming that jumps, or lights that do not switch off fully. New LED downlights have their own driver, which is the part that supplies the right power to the LED. If the driver and dimmer are not compatible, the same problems can appear. ## Which parts can be the problem? - **The lamp:** some LEDs simply do not suit the fitting they are in. - **The transformer or driver:** the part that converts mains power to what the lamp needs. An old halogen transformer may not suit an LED lamp. - **The dimmer:** dimmers made for old bulbs may not work smoothly with LED loads. - **Connections:** a loose connection in a fitting, in a connector block, or in the wiring can cause flicker. From the room, you cannot tell which of these is at fault. Working it out means looking at the parts behind the fitting, which is a job for a licensed electrician. Crackling, heat, discolouration or a burning smell If you see sparks or smoke, or smell burning, leave the building with everyone in it, including children and pets, and call 000. If a downlight or switch buzzes loudly, crackles, looks scorched or discoloured, or you notice a smell, stay away from it, do not touch the fitting or anything wet nearby, and call a licensed electrician urgently. ## What about heat in the ceiling? Downlights sit in a ceiling space, often with insulation nearby. The heat they give off depends on the type of light and the fitting, and it matters how the fitting is installed and what surrounds it. For that reason, changes to downlights, drivers or transformers should be assessed by a licensed electrician, who can also tell you whether your fittings are suited to what you want to put in them. ## Is this a DIY fix? No. In Queensland, electrical work must be done by a licensed electrician, and the Electrical Safety Office Queensland is the regulator. The few tasks a householder may do without a licence are a short list of simple jobs, and swapping transformers, drivers, dimmers or fittings is not among them. Only a licensed person should touch the wiring and fittings behind a ceiling downlight. If the lights are part of a planned upgrade from halogen to LED, a licensed electrician can plan the whole job so the lamps, drivers and dimmers suit each other from the start. ## How does an electrician work out which part is at fault? Patterns help. If every light on one dimmer misbehaves, the dimmer or the drivers are more likely to be the cause. If only one light does, the lamp, its fitting or a connection is more likely. Telling the electrician what you have seen, and when, speeds this up. If you are planning to change from halogen to LED, it is worth asking about the whole system at the start, not just the lamps. A licensed electrician can advise whether your existing transformers and dimmers can be used or need to change. ## What to note before you call about flickering downlights 1. Describe the problem — Is it flicker, buzzing, dimming that jumps, or lights that glow when switched off? When does it happen? 2. Note which lights — Write down how many lights are affected and whether they share a switch or dimmer. 3. Dimmer details — If a dimmer controls the lights, photograph it and its label without removing the cover plate or touching the wiring. 4. Lamp information — Look at any lamp packaging or purchase records you already have to see what type was bought, and pass it on. Do not remove lamps to find out. ## Frequently asked questions - Humming is often a sign that the lamp, driver and dimmer are not a good match. A licensed electrician can identify which part needs to change. - Often an old halogen transformer does not suit LED lamps. A licensed electrician can tell you whether you need a matching driver or new fittings. - No. Dimmers are wired into the home's circuits, and in Queensland that is electrical work for a licensed electrician. - It can be harmless but sometimes points to a poor connection. If there is heat, crackling or a burning smell, keep away and call a licensed electrician urgently. [Learn about Electrical](https://arlite.co/services/electrical/) ## Official guidance For the rules and safety information that apply to your home, go to the regulators and industry bodies directly. - [Electrical Safety Office Queensland](https://www.electricalsafety.qld.gov.au/) - [Energex](https://www.energex.com.au/) Was this helpful? Written by the team at Arlite Energy, a Brisbane business that designs and installs solar, air conditioning and electrical work for homes and businesses. We write these guides in plain English so you know what is happening in your home. ## Related articles - [ElectricalWhy are my lights flickering? Causes and when it’s dangerousFlickering lights can come from the bulb, a dimmer, a loose connection or a street fault; crackling or a burning smell is an emergency.](https://arlite.co/support/electrical/why-are-my-lights-flickering/) - [ElectricalCan I install a ceiling fan myself in Queensland?No: connecting a ceiling fan to mains wiring is electrical work that must be done by a licensed electrician in Queensland.](https://arlite.co/support/electrical/install-ceiling-fan-yourself-queensland/) - [ElectricalCan I do my own electrical work in Queensland?No: in Queensland electrical work must generally be done by a licensed electrician, with only narrow exceptions for minor tasks.](https://arlite.co/support/electrical/diy-electrical-work-legal-queensland/) - [ElectricalHow do I check my electrician is licensed in Queensland?Ask for the electrician's licence number and look it up on the Electrical Safety Office Queensland's online licence search before work starts.](https://arlite.co/support/electrical/check-electrician-licence-queensland/) ## Still stuck? Tell us what is going on and we can arrange a call-out. [Book a call-out](https://arlite.co/contact/) On this page 1. Why do LED downlights flicker or buzz? 2. Which parts can be the problem? 3. What about heat in the ceiling? 4. Is this a DIY fix? 5. How does an electrician work out which part is at fault? 6. What to note before you call about flickering downlights 7. Frequently asked questions --- **Arlite Energy**, Unit 1, 1468 Anzac Avenue, Kallangur QLD 4503. Phone [(07) 3062 9299](tel:+61730629299), email [info@arlite.co](mailto:info@arlite.co). Monday to Friday, 7am to 5pm. Page: https://arlite.co/support/electrical/led-downlights-flickering/ Site index for agents: [llms.txt](https://arlite.co/llms.txt), [sitemap](https://arlite.co/wp-sitemap.xml), [developer resources](https://arlite.co/developers/).