> 2) There is a tendency for utility companies to start checking the power
> factor of residential users (in EU they already do), 

If you mean "there is at least one location in the EC where they do" I 
can't disprove that, but in my country (netherlands, still in the EC 
last time I checked) they certainly don't. I pay for real power only.

Sidenote: Elektor magazine showed some voltage/currents plots for LED 
bulbs. Looked very worrying, not just a phase shift but huge current 
pulses during just a few percent of the phase.

-- 

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: www.voti.nl/hvu

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