Hi, i have two phases in my house, phase1 for first floor and phase2 for second floor. Can someone explain me why could LED light bulb start to flicker, it is not constant, but like 70-80% of time is flickering. Flicker is visible on slowmotion 960fps camera mode when installed in any room on first floor and no flicker on second floor? I also tried swapping the phases at the main breakers so phase1 goes to second floor and phase2 goes to first floor and now is flickering only on second floor. Voltage on both phases is about 220v during flickering.

Bulbs arent dimmable and i try them on normal switches, not dimmers.

About bulb quality-
on bad phase(phase1)- cheap or expensive bulbs like philips "EyeComfort " bulbs flicker, only 2 osram bulbs dont.
on good phase(phase2)- it dosnt matter, none flicker , even cheapest noname

    dovoji6564 Could be a loose or open neutral somewhere at the panel or further upstream. An open or intermittent neutral can be a dangerous problem, and can cause voltage spikes. It’s interesting that this only affects the one phase, so I would look carefully at the neutral to those circuits, otherwise the problem is at the transformer.

    It could also be that phase 1 is shared with a device that is mangling the power factor. Or phase 1 is shared with a noisy device, upstream. Like a motor with bad capacitors.

    Just some ideas!

      dev