ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
nec 110.3 (B)
by gfretwell - 09/22/21 11:11 PM
Grounding electrodes
by gfretwell - 09/07/21 03:41 PM
Looking For Electricians in the Midlands
by Alex247 - 09/06/21 05:26 AM
New in the Gallery:
Now you know.
Now you know.
by Tom_Horne, September 7
February, North East Indiana
February, North East Indiana
by timmp, July 25
Who's Online Now
0 members (), 43 guests, and 25 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Page 1 of 2 1 2
Joined: Nov 2008
Posts: 7
F
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?

Joined: Jul 2004
Posts: 9,663
Likes: 4
G
Member
They are diodes


Greg Fretwell
Joined: Nov 2008
Posts: 7
F
New Member
so they are feeding the bulb un rectidfied dc current? how does this save power?

Joined: Jul 2004
Posts: 9,663
Likes: 4
G
Member
I didn't say it works, that is just what it is.
It may only be half wave.


Greg Fretwell
Joined: Mar 2005
Posts: 1,803
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!
Joined: Mar 2005
Posts: 1,213
S
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.

Joined: Nov 2002
Posts: 790
W
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.

Joined: Mar 2007
Posts: 404
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.

Joined: Feb 2003
Posts: 939
F
Member
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?)

Joined: Jan 2005
Posts: 354
P
pdh Offline
Member
And how will this affect neutral current on wye systems?

Page 1 of 2 1 2

Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
timmp
timmp
Leo, IN, USA
Posts: 27
Joined: June 2004
Top Posters(30 Days)
timmp 3
Popular Topics(Views)
283,074 Are you busy
216,812 Re: Forum
203,189 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5