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On one hand I agree with "small power supply" don't need. Example a small TV. There will be only one on a breaker.need PF correction on such a small power supply?
On the other hand, the assumption, on lighting, (light bulbs) is that there will be many on the same power source.
At 3:00 am, much of the power draw is street lights.
I can not remember now, I think light bulbs cames under different laws than computers, based on how many will likely be on in a single house.
The cheap ($25) 36V PSUs @ 350W deliver around 0.67PF compared to .98 from the Meanwell PSU. In actual terms the calc works out to about 1.5x the power consumed by the cheap unit compared to the Meanwell for a given output.
Also since the MeanWell has no 115/230 V switch and the cheaper unit does....does this mean the MW unit is compatible with 115 to 230VAC al the time?
BTW I am using a Kilawatt unit to assess the power consumed, PF etc.
I think #7 above confirms Schmitt's statement earlier.units employ an active power factor correcting stage,
Hmm, the Killawatt unit reports 1.5X the wattage being consumed with the low PF unit and shows more amps as well, but similar VA.