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1) Just curious, how can the basement fluorescent lights still work when the breaker that controls the lights has tripped? You sure the lights reside on the same circuit?
2) Since the main panel has a GFCI breaker, there is no need and it is not advised to have a GFCI receptacle in the bathroom that resides on the same GFCI breaker. GFCI protection is installed either one or the other and not both..........ie.... either a GFCI breaker is installed or a GFCI receptacle is installed.
3) Depending upon the age of the home, bathrooms should reside on their own dedicated circuits and not shared with a basement.
4) There is no need for lighting to be GFCI protected.
I was in process of writing up some possibilities as there are numerous reasons why the GFCI is tripping. Sorry if I can't type that fast:).
Since you are already dissatisfied with my initial questions and industry standard suggestions, I will opt out of the question and place it back to the open board and another expert can assist you.
Hello Joe. Can you upload a photo of your breaker panel? It is most likely a GFCI breaker. If you know exactly everything on that circuit, and nothing needs to be GFCI protected you could eliminate the breaker and leave the GFCI receptacles in the bathroom. Since you changed over t12 lights to t8 there is a bit a re-wiring in the fixture to the ballast. It is possible that the lights are sharing a neutral with the GFCI breaker, and when the lights are switched on, the breaker trips, because the breaker will sense a difference in current on the neutral.