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Paul wrote:
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But I would assume the bulb lighting up initially, is due
to the initial in-rush current, that charges up the electrolytic
filtering caps, on the outputs of the rectifiers?


** The largest part of the " inrush surge " is down to the iron transformer core *magnetising* and losing nearly all of its inductance at switch own.
Can take 20 cycles of AC power for the core to unmagnetise too.

SMPSs usually surge hard at a switch on too, yours must be an exception.


...... Phil