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"power miser" lightbulb power reducers #190273 11/10/09 04:30 AM
Joined: Nov 2008
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farmANhvacguy Offline OP
New Member
http://www.harrietcarter.com/outlet_household-helper-specials/power-mizer/

has anyone seen these before? looks like a joke to me. What would be the logic behind these things if they even did work???

a resistor?

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Re: "power miser" lightbulb power reducers [Re: farmANhvacguy] #190274 11/10/09 04:49 AM
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gfretwell Offline
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They are diodes


Greg Fretwell
Re: "power miser" lightbulb power reducers [Re: gfretwell] #190276 11/10/09 04:57 AM
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farmANhvacguy Offline OP
New Member
so they are feeding the bulb un rectidfied dc current? how does this save power?

Re: "power miser" lightbulb power reducers [Re: farmANhvacguy] #190279 11/10/09 05:13 AM
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gfretwell Offline
Member
I didn't say it works, that is just what it is.
It may only be half wave.


Greg Fretwell
Re: "power miser" lightbulb power reducers [Re: gfretwell] #190280 11/10/09 10:02 AM
Joined: Mar 2005
Posts: 1,803
Alan Belson Offline
Member
...no noticeable loss of brightness...

Your eyes will easily adjust 0.1 of a stop = 10% reduction in output, and will hardly notice. Color rendition will suffer though. Will they work on a CFL?


Wood work but can't!
Re: "power miser" lightbulb power reducers [Re: Alan Belson] #190287 11/10/09 02:53 PM
Joined: Mar 2005
Posts: 1,213
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SteveFehr Offline
Member
If that's a diode, it's going to be a 50% reduction, not 10%. People may notice flicker, as well, as the frequency will reduce from 120Hz (bright on + and - peaks) to 60Hz (just + peaks).

What they may mean is that dimmers noticibly change the brightness of the bulb and color temperature. This method presumably doesn't.

Re: "power miser" lightbulb power reducers [Re: SteveFehr] #190291 11/10/09 04:49 PM
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wa2ise Offline
Member
Might be a thermistor, a special resistor that is designed to be a high resistance when cold, and when you turn the light switch on, it gets hot and the resistance drops to a low value. This reduces the turn on inrush current on the lightbulb, reducing the stress on the filament, and after the thermistor warms up, the bulb is running at around the 10% reduction that your eyes won't notice.

Half wave diodes will make the lightbulb much dimmer and the light a lot browner.

Thermistors are commonly used in switching power supplies in computers, used to reduce inrush current upon power up.

Re: "power miser" lightbulb power reducers [Re: wa2ise] #190342 11/12/09 01:22 AM
Joined: Mar 2007
Posts: 404
noderaser Offline
Member
Flicker shouldn't be a problem with a standard bulb shouldn't be a problem, as it's unlikely that the filament would cool enough in 1/60 second to be noticeable to the human eye.

I'm assuming any such devices would not make a CFL very happy.

Re: "power miser" lightbulb power reducers [Re: noderaser] #190348 11/12/09 04:07 AM
Joined: Feb 2003
Posts: 939
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frenchelectrican Offline
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I have see that " energy saver button " for so many years I know the early one were dimmed to about half brightness due it converted from AC to DC in half wavefourm.

Oh yeah the CFL will not like the energy saver button at all it will wreck hovac on the electronic units.

Higher wattage bulbs are not too noticable with flicker as long it stay above 40 HZ but once you get down below 40 HZ { it don't matter if sine wave or chopped DC wave } it will flicker. { it can get really bad like old 25 HZ days }

Merci,Marc


Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)

Re: "power miser" lightbulb power reducers [Re: frenchelectrican] #190371 11/13/09 02:46 PM
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Posts: 354
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pdh Offline
Member
And how will this affect neutral current on wye systems?

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