Key Takeaways
- Most lights flickering at home come down to the bulb: loose, failing, or a non-dimmable LED on a dimmer switch. Those are safe DIY checks.
- Light bulb replacement costs S$15 in Singapore and takes about 20 minutes with Urban Company, if you’d rather not get on a ladder.
- A quick dip when the aircon starts is common. Heavy dimming, or flicker on 1 circuit every time, means the circuit needs checking.
- Buzzing, a warm switch or a burning smell is not a bulb problem. Switch off at the consumer unit and call a Licensed Electrical Worker.
- Whole block flickering is a supply problem for SP Group. Whole flat only is a fault in your own installation.
The Kitchen Light in Ang Mo Kio
It’s 10pm in your 4-room resale flat in Ang Mo Kio and the kitchen LED panel has started strobing. Switching it off and on buys you 5 minutes. The bedroom lights are fine. Before you buy a new panel, spend 2 minutes working out whether it’s the light, the switch or the wiring.
Why Are My Lights Flickering?
Lights flicker because the power reaching them isn’t steady, and the cause is usually close to the light itself. LEDs react to small changes faster than old bulbs, so flicker shows up more now that HDB ceilings mostly run LED panels and downlights. The 6 usual causes, most likely first:
- A loose bulb. Poor contact in the holder makes the light cut in and out.
- A bulb or tube near the end of its life. LEDs often flicker before they fail. Older fluorescent tubes flicker and blacken at the ends.
- A dimmer the LED isn’t made for. A non-dimmable LED on a dimmer will flicker or buzz, and some dimmers don’t work well with LEDs at all.
- A failing LED driver, starter or ballast inside the fitting.
- A loose connection at the switch, the ceiling rose, the fitting or the consumer unit. This is the one that matters for safety.
- Voltage dips when a large appliance like the aircon, water heater or oven switches on.
Is a Flickering Light Dangerous?
A single flickering bulb usually isn’t, but flicker with heat, buzzing or a burning smell is. Those point to a loose or overheating connection, which is how many wiring fires start. MHA told Parliament that residential fires of electrical origin held at 250 to 300 cases a year from 2018 to 2022, and that these can be caused by faulty appliances or wiring.
If you see smoke or scorch marks, switch off at the consumer unit and call 995.
Symptom, Likely Cause and What to Do
| What you notice | Likely cause | What to do |
|---|---|---|
| 1 bulb flickers, others on the circuit are fine | Loose or failing bulb | Reseat it, then try a new bulb |
| LED flickers or buzzes on a dimmer | Non-dimmable LED, or dimmer not LED-compatible | Fit a dimmable LED; if it persists, the dimmer needs replacing |
| Integrated LED panel or downlight strobes | Failing LED driver | Replace the fitting or driver (electrician) |
| Fluorescent tube flickers, ends blackened | Tube or starter failing | Replace tube or plug-in starter; ballast is an electrician job |
| Lights dip briefly when the aircon starts | Common voltage dip | Nothing, unless it’s heavy or getting worse |
| Flicker with buzzing, warm switch or burning smell | Loose or overheating connection | Switch off at the consumer unit, call an LEW |
| Every light in the flat flickers | Consumer unit or supply fault | Check neighbours, then LEW or SP Group |
What Can You Safely Check Yourself?
You can safely check the bulb, and only the bulb. Do these in order, with the switch off and the bulb cool:
- Reseat the bulb. Twist it out and back in firmly.
- Swap the bulb. Try a new one, or move the flickering bulb to a fitting that works. If the fault follows the bulb, you’ve found it.
- Check for a dimmer. On a dimmer, the bulb must say “dimmable”.
- Note what else is on. If it only flickers when the aircon or water heater starts, tell the electrician.
Stop there. Don’t open the fitting, remove a switch plate or touch anything inside the consumer unit. EMA requires electrical works at home to be done by a Licensed Electrical Worker, including repair or replacement. If the ceiling is out of reach, light bulb replacement with Urban Company is S$15 and takes about 20 minutes.
Old fluorescent tubes contain trace mercury and count as e-waste, per NEA, so keep them out of the rubbish chute.
Why Is My LED Light Flickering After a New Bulb?
If a new LED still flickers, the problem is in the fitting, the switch or the wiring, not the bulb. Many HDB and condo ceilings use integrated LED panels and downlights with no bulb to swap, so when the driver fails the whole fitting usually needs replacing. Downlight LED supply and installation is S$59 and takes about 45 minutes.
A buzzing switch, or a ceiling light flickering when a door closes, suggests a loose connection. That’s a fault to find, not a part to replace.
Why Are All the Lights in My Flat Flickering?
Start by checking whether it’s just your flat. Look at the corridor lights and ask a neighbour. If the whole block is flickering, it’s a supply problem for SP Group. If it’s only your flat, the fault is in your own installation, often a loose connection at the consumer unit.
Wiring age matters too. HDB’s home-care guide advises replacing your flat’s electrical wiring when its lifespan is over or it is worn out, so lights flickering in HDB resale flats are worth having checked. If the power trips rather than flickers, our guide to why your breaker keeps tripping covers that separately.
When Should You Call an Electrician?
Call one when a new bulb hasn’t fixed it, more than 1 light is affected, or there’s any heat, buzzing or smell. Wiring work is regulated, so ask whether the person attending is a Licensed Electrical Worker before work starts.
Before booking, read how to choose an electrician in Singapore, where a cheap electrician is fine and an electrician price list with real times. For every current service, see the full electrician price list and book an electrician in Singapore.
Frequently Asked Questions
Why are my lights flickering?
Most often it is the bulb: loose in its holder, near the end of its life, or a non-dimmable LED on a dimmer. If several lights flicker together, look at what else is running, since a large appliance starting up can dip the voltage. Flicker that persists across new bulbs points to a loose connection.
Are flickering lights dangerous?
A single bulb flickering is usually harmless. It becomes a safety issue when the flicker comes with buzzing, a warm or discoloured switch, a burning smell, or affects the whole flat. Those point to a loose or overheating connection. Switch the circuit off at the consumer unit and have a Licensed Electrical Worker check it.
Why is my LED light flickering?
LEDs react to small changes in power faster than old bulbs, so they show problems sooner. The common causes are a dimmer switch the LED isn’t rated for, a failing LED driver inside the fitting, or a loose connection. If a dimmable LED still flickers on a dimmer, the dimmer itself may be incompatible.
Why do my lights dim when the aircon turns on?
When the aircon compressor starts, it draws a burst of current that can dip the voltage for a moment, and LEDs show it as a brief flicker. A short dip is common. If the lights dim heavily, dim every time on 1 circuit, or the breaker trips, have an electrician check the circuit and its connections.
Why are all the lights in my flat flickering?
Check whether your neighbours and the corridor lights are flickering too. If the whole block is affected, it is a supply problem, so contact SP Group. If only your flat is affected, the fault is in your own installation, often a loose connection at the consumer unit. That is a job for a Licensed Electrical Worker.
Can I fix a flickering light myself?
Partly. With the switch off and the bulb cool, you can reseat a loose bulb, swap in a new one, try it in another fitting, or replace a non-dimmable LED on a dimmer with a dimmable one. Anything inside the fitting, behind a switch plate or in the consumer unit is regulated work for a Licensed Electrical Worker.
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