They are all the same.
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.
They are 4 foot flourescent fictures.
I have 4 ceiling lights.
If your light is already flickering try toggling the switch on and off and see if this fixes the problem.
That may be all you need to do but if the bulb still flickers remove it and try another bulb.
Try gently wiggling the switch to see if this causes a flicker.
Common cause of ceiling fan light problems.
Led bulb flickering can be traced in almost every instance to a non compatible dimmer switch in the lighting circuit.
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.
In 3 lights they are fine and bright.
A poor connection between the light or fixture switch and the bulb can cause flickering.
Modern dimmer switches create the dimming effect by switching the power supply.
Additional possibilities with ceiling fan light strobe.
I put two of the working lights in flashing fixture and they strobed as well.
They were normal florescents and i changed to 4 foot led bulbs.
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.
If it does you ve found the problem.
It only happens in the one fixture.
This professional electrician should not make mistakes.
The 4th flashes on an off like a strobe.