Somehow I suspect it was easier/safer to couple RF onto the AC Mains at RF then to extract raw 60Hz plus harmonics. The BSR- X10? control system used carrier current. AC light dimmers often made them unusable.
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If you think old style, magnetic ballast, florescent light were noisy, the modern ones with electronic ballasts are a whole new level of trashy noise.? Probably less harmonic distortion of the 60Hz, but a nightmare of RF EMI.
