replacing fluorescent tube light with regular bulbs
If you have multiple fluorescent lights having problems all the time, I would suspect maybe the bulbs aren’t ‘set’ in the holders properly or wiring/connection problems. Check that the bulbs are ‘set’ fully. Might check the wire connections inside the light fixtures for loose connections. Check the connections at the switch too. If they’re stabbed into the back of the switch, remove them and attach them to the screws on the side, the screws will provide a better connection.
Just because you can, doesn't always mean you should