Re: Strange phenomenon involving CFL bulb
Perhaps the CFL has a class X capacitor or other suppression components, and is -- by happy accident -- cleaning up the whole ring main when it is switched on?
It's even possible that the inductance of the mains wiring to the lamp is forming a tuned circuit that, together with the class X capacitor in the lamp, is absorbing the interference. Does it still do it with the lamp plugged into a different socket, or through an extension lead, so there is a different length of wire in play?
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