All phase controlled dimmers tregard;ess of circuit design or load need to be able to synchronize with the AC line and most importantly detect the AC Zero Crossing point. The reason why LEDs flicker when dimmed by conventional dimming technology is due to the dimmer trying to find the Zero Crossing which with LED technology is proving really challenging. There is a call internationally for Three wire electrical installations with an added neutral wire in the switch box to provide an essential return path for the dimmer.
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