Symptoms
- Light flickers on and off, especially in damp or cold weather
- Flicker is worse at dusk when the sensor first activates
- Bulb may look fine when removed and inspected
Likely causes
- CommonA loose bulb in the socketOutdoor sockets can loosen with vibration and temperature swings.
- CommonMoisture affecting the socket or dusk sensorHumidity and rain exposure are more common outdoors and can cause intermittent contact.
- PossibleA failing built-in dusk-to-dawn sensorThese small sensors can flicker as they fail, especially right at dusk.
- PossibleA loose wire connection in the fixture baseWorth checking if tightening the bulb and drying the fixture doesn't help.
What to do
- Turn off the fixture and let it cool, then tighten the bulb gently.
- Try a different bulb to rule out a failing one.
- Check for any visible moisture inside the fixture and let it dry out if found.
- If it has a built-in dusk sensor, note whether flicker happens specifically as it's switching on at dusk.
- Turn off the breaker and check the gasket and seal for gaps letting in moisture.
- Check for a loose wire connection inside the fixture base with the breaker off.
- Replace the fixture or its sensor if flicker continues after drying it out and checking connections.
Tools and parts
- Screwdriver
- Non-contact voltage tester
Outdoor light fixture with dusk sensorSearch: “dusk to dawn outdoor light fixture”
When to call a pro
Call an electrician if flicker continues after drying out the fixture and checking connections.
Safety
Use caution
Turn off the breaker before opening the fixture, and don't handle it with wet hands.