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I built a shop within an unused 3-story ag building. When I installed my lights, I found that dimming ballasts on T8 lamps obliterated AM reception and that standard electronic T8 ballasts caused severe interference on FM that other post T12-era lighting causes. older T-12 and other magnetic ballast lighting only needs a good ground, rarely does it cause this.
Unfortunately,it is acceptable to FCC. I grounded lighting and switched phases without much improvement as the fluorescent tubes actually radiated the interference. So much for indoor antennas.
I got an LED shoplite at costco, no interference at all.
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"When resistors increase in value, they're worthless"
-Dave G
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