Lighting Problems and How to Fix Them: The Complete Australian Guide
TL;DR: Most household lighting faults trace back to a short list of causes. In an LED fitting, an incompatible dimmer is the most common explanation for flickering, buzzing and poor dimming, and a loose or failing globe accounts for much of the rest. This guide takes the symptoms one at a time and names the most likely cause for each, inside a firm boundary: switch off at the wall, let the fitting cool, reseat or replace a like-for-like globe. Everything past that belongs to an electrician.
Key Takeaways
- With LED, suspect the dimmer first. An incompatible or underloaded dimmer is the most common cause of flickering, buzzing and dimming that works over part of the range only. The globe is often innocent.
- Your safe DIY list is short and fixed. Switch off at the wall, let the fitting cool, reseat or replace a like-for-like globe in a fitting designed for a replaceable globe, and note whether the fault follows the globe or stays with the fitting. Anything touching wiring, the canopy, the driver, the dimmer, the switch, the circuit or the switchboard is work for a licensed electrician under AS/NZS 3000.
- A burning smell, discolouration, heat marking or a breaker that trips repeatedly means stop. Switch that circuit off at the switchboard, leave it off, and call a licensed electrician immediately. Do not keep resetting the breaker and do not keep using the fitting.
- Diagnose by following the globe. If the fault travels with a globe moved to another fitting, it is the globe. If it stays with the fitting, the fitting or circuit needs an electrician.
- An integrated LED fitting has no globe to change. With the light source built in, there is nothing to swap, so a dead integrated fitting is an electrician job or a warranty claim.
Lighting faults arrive at the worst moment and rarely explain themselves. A chandelier starts to shimmer during dinner. A fan light refuses to come on while the fan still turns. New globes look faintly green beside the old ones. The instinct is to climb up and start pulling things apart, and that is the instinct worth resisting.
Almost every lighting symptom has a most likely cause you can identify from the floor, by watching how the fault behaves rather than by opening anything. Does it affect one fitting or several. Does it change when the dimmer moves. Does it follow the globe. Those three observations usually tell you whether you are looking at a globe you can replace or electrical work you need to book. This guide is arranged by symptom, so you can go straight to what you are seeing.
On this page
- Key takeaways
- Safe DIY and the boundary
- Symptom quick reference
- Flickering
- Buzzing or humming
- Will not turn on
- Turns off by itself
- Dims badly or flashes
- Uneven colour
- Globes failing fast
- Fan light wobble
- Discolouration and heat marks
- Frequently asked questions
Safe DIY, and where the line sits
There are only five things a householder should do to a light fitting: switch it off at the wall, let it cool, reseat a loose globe, replace a like-for-like globe in a fitting designed for a replaceable globe, and note whether the fault follows the globe or stays with the fitting. That is the whole list. Anything involving wiring, the canopy, the driver, the dimmer, the wall switch, the circuit or the switchboard is electrical work for a licensed electrician under AS/NZS 3000.
A ceiling fitting sits on a circuit that stays energised when the wall switch is off, and unlicensed work is a common reason for an insurance claim to be contested after a fire. So, whatever a video suggests: do not open or dismantle a fitting, do not test anything live, and do not touch a dimmer or driver.
Our guide to replacing chandelier globes safely covers the one job that is yours.
| Symptom | Safe for a householder | Licensed electrician |
|---|---|---|
| Globe dark or visibly broken | Switch off, cool, replace like for like | Only if the new globe also fails |
| Globe loose, light cuts in and out | Switch off, cool, reseat by hand | If reseating does not hold |
| Flicker, buzz or poor dimming | Note the fittings and dimmer positions affected | Dimmer assessment |
| Integrated LED fitting dead | Nothing, there is no replaceable globe | All of it, plus any warranty claim |
| Fitting switching itself off | Switch off, cool, record the pattern | Thermal and driver assessment |
| Fan light wobble or rattle | Observe at each fan speed and report | Mounting, balance and blade work |
| Tripping breaker or burning smell | Switch off at the switchboard, stop using it | Immediately, as an urgent call |
Symptom quick reference
Find the symptom, read the most likely cause, then read the section below. These are likelihoods rather than certainties, because one symptom can have several sources. Chandelier problems and fan light problems follow the same pattern, since the variables are the control gear and the globe.
| Symptom | Most likely cause | Who fixes it |
|---|---|---|
| Flickering or shimmering | Incompatible dimmer on an LED load | Electrician, once the globe is ruled out |
| Buzzing or humming | Dimmer and driver interaction | Electrician |
| Will not turn on | Failed globe, driver or circuit fault | Householder for the globe, else electrician |
| Turns off by itself, then returns | Thermal cutout on an overheating fitting | Electrician |
| Dims badly or flashes low | Dimmer compatibility or minimum load | Electrician |
| Uneven colour between fittings | Mixed colour temperatures or batches | Householder, by matching globes |
| Globes failing fast | Heat in an enclosed or unventilated fitting | Householder for globes, else electrician |
| Fan light wobbling or rattling | Balance, mounting or a blade out of seat | Electrician |
| Discolouration or burning smell | A fault that must be isolated now | Electrician, urgently |
Why is my light flickering
In an LED fitting, the most common cause of flickering is a dimmer that was never designed for LED load. Many Australian homes still run dimmers specified for halogen, which expected a far heavier load than LED globes draw. Starved of that load, the dimmer delivers power unevenly and the light shimmers, pulses or strobes, usually worst at the low end of the dial.
After the dimmer, likelihood runs: a globe not fully seated, making intermittent contact; a globe near the end of its life; a loose connection in the fitting or at the switch, which looks identical from the floor; then supply issues, worth suspecting when several fittings flicker together. A flicker only at low dimmer settings is close to conclusive evidence of a compatibility problem.
Switch off at the wall, let the fitting cool, reseat each globe, then try a known good globe. If the flicker survives that, the next step is a licensed electrician assessing the dimmer and connections, not more globes. For multi-arm fittings read how to troubleshoot a flickering chandelier, and why LED chandeliers flicker covers drivers and dimmer curves.
Why is my LED light buzzing or humming
The most common cause of an LED light buzzing is interaction between the dimmer and the driver inside the globe or fitting. An LED driver switches current rapidly to regulate output, and when a dimmer chops the incoming waveform in a way the driver does not expect, small components vibrate audibly, whether in the fitting, the globe or the wall plate.
Dimmer type matters more than any other factor. Older magnetic and leading-edge dimmers were built for halogen loads and are the usual source of complaints, while trailing-edge dimmers switch more gently and suit LED better. A loose shade or glass cup can also rattle in sympathy, and a buzz present with the dimmer fully up points at the driver.
Note whether the noise changes with dimmer position, whether it affects one fitting or all, and whether it stops with a particular globe out. That is useful for your electrician. Do not open the fitting or touch the dimmer or driver. See our guide to a buzzing or humming LED chandelier for the longer version.
| Dimmer type | What it suits | Typical result on an LED circuit |
|---|---|---|
| Leading-edge, magnetic | Halogen and iron-core transformers | Frequent buzz, flicker, narrow usable range |
| Trailing-edge, electronic | LED and electronic transformers | Generally quiet, smoother low-end control |
| Universal, LED-rated | Mixed circuits where load varies | Usually acceptable if minimum load is met |
| Smart or app-controlled | Scene control and scheduling | Depends on the globe being listed as compatible |
| No dimmer, switch only | Non-dimmable LED fittings | Quiet, and any buzz points at the driver |
Dimmer replacement is electrical work. Give your electrician the dimmer and globe models.
Why will my light not turn on
Where the fitting takes a replaceable globe, a failed globe is the most likely cause, and it is the one thing you can rule out yourself. Beyond that the realistic candidates are the wall switch, the driver or transformer, and the circuit, and all three sit on the electrician side of the line.
Work outwards. If nothing on the circuit works, the problem is upstream and a tripped breaker is likelier. If other lights work and this one does not, switch off at the wall, let the fitting cool and try a known good globe of the correct base type. The integrated LED case surprises people: many slim pendants, strip fittings and fan lights have the LED built into the body, so there is no globe to change and the cause is usually the driver, meaning a licensed electrician or a warranty claim.
Fan lights add a layer, because light and motor often run on separate controls, so a remote can be at fault while the fitting is healthy. If the fan turns and only the light is dead, note that. Our guide covers a ceiling fan light that will not turn on in order, and you can see how the light source is integrated across our ceiling fan light range.
Why does my light turn off by itself
A light that switches itself off after a period of use and returns later is most often a thermal cutout doing its job. LED fittings and their drivers are temperature sensitive, and many shut output down once an internal threshold is passed, then recover as the fitting cools. The protection is a safety feature rather than the fault.
The underlying cause is nearly always heat with nowhere to go: an enclosed fitting, a recessed fitting with insulation packed against it, a globe above the wattage the fitting is designed to carry, or a driver in a sealed ceiling cavity. Less commonly a failing driver cuts out with no heat problem. A cutout after twenty minutes to an hour, recovering once the light is off, points at heat, while random switching points at the driver. Either way the fix belongs to a licensed electrician.
| Enclosed or restricted fitting | Why heat builds up | Risk if ignored |
|---|---|---|
| Sealed glass or acrylic oyster | No airflow around the globe | Short globe life, repeated cutouts |
| Downlight with insulation against it | Heat cannot escape the roof space | Driver stress, discolouration, fire risk |
| Enclosed outdoor or bulkhead fitting | Sealed for weather, so sealed for heat | Premature failure, especially in summer |
| Fan light with a closed glass dish | Trapped heat plus vibration | Rapid globe failure, loose components |
| Globe above the rated wattage | More heat than the fitting was built for | Heat marking at the socket, warranty void |
For a closed fitting, choose a globe rated for enclosed use and keep to the marked wattage. Our note on how long LED globes actually last explains why heat, not switching, decides whether a globe reaches its rated hours.
Why does my light dim badly or flash at low output
Dimming that works over only part of the range, drops out near the bottom, or flashes at low output is almost always a dimmer compatibility problem rather than a faulty light. Two mechanisms produce it.
The first is the dimming curve: a dimmer built for halogen expects output to fall smoothly as the waveform is cut back, and LED drivers do not behave that way, so the usable range compresses and half the dial does almost nothing. The second is minimum load, since most dimmers need a certain load to stay stable and an LED circuit may draw far less, which shows as flashing or a light that will not stay on when wound down.
Before anyone blames the fitting, confirm from the packaging that every globe on the circuit is dimmable, that they are the same model, and that nothing non-dimmable is mixed in. That step resolves many complaints. If it persists with a matched set, only a licensed electrician should replace the dimmer. Fan lights are the most pairing-sensitive case, and dimmable LED globe compatibility in fan lights sets out what to check.
Why do my fittings look different colours
When two fittings in the same room read as different colours, the cause is mixed colour temperatures or mixed production batches, not a fault in either fitting. It is a purchasing problem rather than an electrical one, which makes it one of the few symptoms a householder can fully resolve.
Colour temperature is the obvious version: a 2700K globe beside a 4000K globe is immediately visible, one warm and yellow, the other white and clinical. Less obvious is batch variation, where two globes of the same brand and stated temperature differ enough to notice side by side. Mixing brands widens that spread, and a room part-converted from halogen will nearly always look mismatched.
The fix is methodical rather than clever. Replace all the globes in a room at once, same brand, same model, same colour temperature, ideally the same batch, and keep a spare so a later failure can be matched. For a room running both technologies, how LED and halogen compare in practice explains why they will never quite agree.
Why do my globes keep failing so fast
When globes fail well short of their rated life, heat is the most common cause, and the fitting rather than the globe is usually what creates it. LED lifespan is temperature dependent, so a globe run hotter than it was designed for will not reach its rated hours.
The heat sources repeat the pattern above: an enclosed fitting with no airflow, a recessed fitting crowded by insulation, a globe above the rated wattage, a sealed outdoor fitting in a hot position. Vibration is the second factor, which is why globes in a fan light often fail faster than identical globes elsewhere, as movement works a globe loose. Voltage fluctuation and a mismatched dimmer also stress a driver, and globes failing fast across a whole circuit points at the circuit.
Match the globe to the fitting, choose one rated for enclosed use where the fitting is sealed, keep to the marked wattage, and reseat globes in a fan light if they work loose. Do not keep feeding a fitting that eats globes: two or three early failures in one socket is the signal to have a licensed electrician look at it. Vibration is covered in our guide to choosing a ceiling fan with a light.
Why does my ceiling fan light wobble or rattle
A wobbling or rattling fan light is most often a balance problem in the blades, with mounting and blade seating the next likeliest causes. A little movement at high speed is normal. Movement that grows, changes with speed, or comes with a rattle is worth taking seriously, because vibration damages globes, loosens fixings and works on the mounting over time.
Blades are a matched set, so a difference in weight or pitch between them, from tolerance, warping or uneven dust, shows up as a wobble, and a blade loose at its arm changes the geometry enough to see. Then the mounting, since a fan carries dynamic load and must be fixed to structure that can take it, which is why fan installation is licensed work. A rattle often comes from the light assembly instead, where a glass dish or loose globe buzzes against a sound fitting.
Note whether the wobble appears at all speeds or one, whether it has worsened, and whether the noise is a rattle or a hum. Then book an electrician, because balancing, reseating blades and anything involving the mounting or canopy are not DIY tasks. One planning note: keep 2.1m of clear head height under any fitting in a walkway, which matters in a typical Australian ceiling of 2.4-2.7m. Our guide to diagnosing a wobbling ceiling fan goes through the sequence in depth.
Discolouration and heat marks: stop and call an electrician
Browning, yellowing, scorch marking, a melted or deformed surface, or any smell of burning around a light fitting means stop using it now. Switch that circuit off at the switchboard, leave it off, and call a licensed electrician immediately. The same applies to a repeatedly tripping breaker, a fitting or switch plate hot to the touch, and crackling from a fitting.
These are not symptoms to diagnose. They indicate heat being generated where it should not be, and the usual sources are the ones that cause fires: a poor connection running hot, a failing driver, an overloaded fitting, or insulation packed against a recessed fitting. Two points deserve repeating. Do not keep resetting a breaker that trips again, because each reset re-energises a known fault. And do not keep using the fitting because the light still works.
Any replacement must be installed by a licensed electrician to AS/NZS 3000, which is the chance to correct whatever created the heat. Our chandelier installation guide sets out what a compliant installation involves.
If a fault has reached the point where the fitting needs replacing, choose one specified properly for its position: the right globe type, dimmable where you want dimming, rated for enclosed use if sealed. You can browse the chandelier collection with those requirements in mind, then ask your electrician to confirm the mounting and dimmer pairing.
Frequently Asked Questions
Why is my light flickering?
With an LED fitting the most common cause is a dimmer never designed for LED load. A loose globe is next, then a loose connection in the fitting or circuit. Switch off at the wall, reseat the globe, and if it continues, book an electrician.
Is a flickering light dangerous?
Usually it is a compatibility or connection issue rather than a hazard. Treat it as urgent if the flicker spreads to other lights, arrives with a burning smell, or the breaker trips. Then switch off at the switchboard and call a licensed electrician.
Why is my LED light buzzing or humming?
The most common cause is interaction between the dimmer and the LED driver. Older magnetic and leading-edge dimmers frequently hum on LED load. Some buzz comes instead from a loose component in the fitting. Changing a dimmer is electrician work.
Why will my light not turn on at all?
Check the simple things first: the wall switch, the globe, and whether other lights on the circuit work. If the fitting has an integrated LED there is no globe to change, so a dead fitting usually means driver or circuit work for a licensed electrician.
Can I change a light globe myself in Australia?
Yes, in a fitting designed for a replaceable globe. Switch off at the wall, let the fitting cool, and fit a like-for-like replacement. You should not open the fitting, touch any wiring, or attempt to replace an integrated LED module yourself.
Why do my LED globes keep failing so quickly?
Heat is the usual culprit. Enclosed fittings, recessed spaces with no airflow and vibration near a ceiling fan all shorten LED life. Mismatched globes and an unstable supply also contribute. If globes fail fast across a whole circuit, have an electrician check it.
Why do two lights in the same room look different colours?
Almost always mixed colour temperature or mixed production batches. Globes sold as warm white vary between brands and runs, and LED and halogen never match. Replace a room with the same brand, colour temperature and ideally the same batch.
What should I do if I smell burning from a light fitting?
Stop using it. Switch that circuit off at the switchboard, leave it off, and call a licensed electrician immediately. A burning smell, browning, scorch marking or a repeatedly tripping breaker all point to a fault that must not stay in service.
Lighting troubleshooting rewards patience over effort. Note whether the fault affects one fitting or many, whether it moves with the dimmer, and whether it follows the globe. Those observations place almost every fault in the right category before anyone picks up a tool. Then act within the boundary: switch off at the wall, reseat or replace a like-for-like globe in a fitting designed for one, and hand everything else to a licensed electrician working to AS/NZS 3000. Treat a burning smell, discolouration or a repeatedly tripping breaker as a stop sign, switch off at the switchboard, and make the call.
Written by William Walker.