Try gently wiggling the switch to see if this causes a flicker.
Led ceiling light flashes.
If you re able to verify that the ceiling fixture is the only one flickering get a ladder and try tightening the light bulb.
I put two of the working lights in flashing fixture and they strobed as well.
Common cause of ceiling fan light problems.
If it does you ve found the problem.
Faulty light or fixture switch.
Led bulb flickering can be traced in almost every instance to a non compatible dimmer switch in the lighting circuit.
The most common cause of ceiling fan lights that strobe like this is due to wrong size light bulbs more specifically the light bulb size may be too large so i would check this first and make sure they are the recommended size.
It only happens in the one fixture.
Modern dimmer switches create the dimming effect by switching the power supply.
They were normal florescents and i changed to 4 foot led bulbs.
In 3 lights they are fine and bright.
That may be all you need to do but if the bulb still flickers remove it and try another bulb.
If your light is already flickering try toggling the switch on and off and see if this fixes the problem.
Additional possibilities with ceiling fan light strobe.
If the flickering bulb is a cfl try replacing it with an led or incandescent bulb.
I have 4 ceiling lights.
They are all the same.
This professional electrician should not make mistakes.
If the led light flashes when it is turned off we first need to eliminate the circuit problem that is the switch touches the live wire and the zero wire touches the electrical appliance.
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