Electricity providers don't like you if your loads are making their generators work harder than your local meter indicates. This is why they levy an additional charge if they don't like your power factor.It's not so much that the fixtures change their draw. It's that some devices have 'non-linear' impedance. Look up "reactance"
Capacitors and inductors react differently to AC than to DC. Both 'charge' and discharge as the voltage changes, 120 times a second. This causes extra current in the supply without affecting the total power used. If you try to imagine it in simple water flow terms it seems crazy.
Autotransformers can change their power factors as the control changes the size of an inductor. Variable capacitors are often found in radios as tuners but that's usually DC.
Many. Almost all LED fixtures and most smaller moving lights are auto-ranging; will work with any voltage from 100-240VAC. In the US, we will most likely be dealing only with either 120V or 208V bi-phase.... Are there fixtures that can change their amp draw and how is it done?
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