Symptoms
- Bulb flickers randomly throughout the day
- Flickering worse when other devices turn on
- Bulb blinks in a pattern that seems related to connectivity
- Flickering only happens with a dimmer switch installed
Likely causes
- CommonBulb installed with an incompatible dimmer switchMost smart bulbs should be used with a standard on/off switch since built-in dimming can conflict with an external dimmer, causing flicker.
- CommonLoose bulb or socket connectionA bulb not fully screwed in can flicker with any vibration or temperature change.
- PossibleWeak Wi-Fi or hub signal causing repeated reconnectsSome bulbs blink visibly while attempting to reconnect to a dropped network.
- PossibleVoltage fluctuation on the circuitOther high-draw appliances on the same circuit can cause visible flicker in sensitive electronics like smart bulbs.
- Less commonBulb driver or LED failureInternal electronics degrading over time can cause flicker independent of wiring or network.
What to do
- Confirm the wall switch is a standard on/off switch, not a dimmer, unless the bulb is specifically rated for dimmer compatibility.
- Turn off power and reseat the bulb firmly in its socket.
- Check Wi-Fi or hub signal strength in the app at that fixture's location.
- Note whether flickering coincides with another large appliance turning on, which points to a circuit voltage issue.
- Test the bulb in a different known-good fixture to isolate the bulb from the wiring.
- Restart the bulb by power-cycling it and check if flickering stops afterward.
- Replace the bulb if flickering continues in a good socket with no dimmer and strong signal.
Tools and parts
Replacement smart bulbSearch: “smart wifi light bulb”
When to call a pro
If flickering happens on multiple bulbs on the same circuit, or you suspect a wiring issue, call a licensed electrician.
Safety
Use caution
If flickering seems tied to the home's wiring or a whole circuit rather than one bulb, have an electrician inspect it rather than continuing to use that circuit.