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#190273 - 11/10/09 04:30 AM "power miser" lightbulb power reducers  
farmANhvacguy  Offline
New Member
Joined: Nov 2008
Posts: 7
wisconsin
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?


Work Gear for Electricians and the Trades

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


Member
Joined: Jul 2004
Posts: 9,060
Estero,Fl,usa
They are diodes


Greg Fretwell

#190276 - 11/10/09 04:57 AM Re: "power miser" lightbulb power reducers [Re: gfretwell]  
farmANhvacguy  Offline
New Member
Joined: Nov 2008
Posts: 7
wisconsin
so they are feeding the bulb un rectidfied dc current? how does this save power?


#190279 - 11/10/09 05:13 AM Re: "power miser" lightbulb power reducers [Re: farmANhvacguy]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,060
Estero,Fl,usa
I didn't say it works, that is just what it is.
It may only be half wave.


Greg Fretwell

#190280 - 11/10/09 10:02 AM Re: "power miser" lightbulb power reducers [Re: gfretwell]  
Alan Belson  Offline
Member
Joined: Mar 2005
Posts: 1,803
Mayenne N. France
...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!

#190287 - 11/10/09 02:53 PM Re: "power miser" lightbulb power reducers [Re: Alan Belson]  
SteveFehr  Offline
Member
Joined: Mar 2005
Posts: 1,198
Chesapeake, VA
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.


#190291 - 11/10/09 04:49 PM Re: "power miser" lightbulb power reducers [Re: SteveFehr]  
wa2ise  Offline
Member
Joined: Nov 2002
Posts: 782
Oradell NJ USA
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.


#190342 - 11/12/09 01:22 AM Re: "power miser" lightbulb power reducers [Re: wa2ise]  
noderaser  Offline
Member
Joined: Mar 2007
Posts: 404
Portland, Oregon, United State...
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.


#190348 - 11/12/09 04:07 AM Re: "power miser" lightbulb power reducers [Re: noderaser]  
frenchelectrican  Offline
Member
Joined: Feb 2003
Posts: 939
Wi/ Paris France { France for ...
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?)


#190371 - 11/13/09 02:46 PM Re: "power miser" lightbulb power reducers [Re: frenchelectrican]  
pdh  Offline
Member
Joined: Jan 2005
Posts: 354
And how will this affect neutral current on wye systems?


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