That may be all you need to do but if the bulb still flickers remove it and try another bulb.
Led ceiling light flashes.
A poor connection between the light or fixture switch and the bulb can cause flickering.
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.
They are 4 foot flourescent fictures.
If the flickering bulb is a cfl try replacing it with an led or incandescent bulb.
They are all the same.
Common cause of ceiling fan light problems.
If your light is already flickering try toggling the switch on and off and see if this fixes the problem.
Led bulb flickering can be traced in almost every instance to a non compatible dimmer switch in the lighting circuit.
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.
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Faulty light or fixture switch.
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.
Additional possibilities with ceiling fan light strobe.
The 4th flashes on an off like a strobe.
They were normal florescents and i changed to 4 foot led bulbs.
Try gently wiggling the switch to see if this causes a flicker.
Modern dimmer switches create the dimming effect by switching the power supply.
This professional electrician should not make mistakes.