We were having an issue with our recently-installed whole house generator, where the lights would dim and flash every time the AC kicked on while the generator was running. This was during the big storm last year when we were without power for about a week. It was even investigated whether the unit was sized right for the house. Frank came out and after much diagnostic work, asked about the type of lights in the house. Turns out the the dimmable LED units will behave like that during an AC draw.
Mystery solved.
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