Dimming and LED lighting - Electrician Talk - Professional Electrical Contractors Forum
CLICK HERE AND JOIN OUR COMMUNITY TODAY, IT'S FREE!
Go Back   Electrician Talk - Professional Electrical Contractors Forum > Electrical Trade Topics > Lighting Design


Like Tree7Likes
  • 1 Post By LawnGuyLandSparky
  • 1 Post By PlugsAndLights
  • 1 Post By V-Dough
  • 1 Post By chicken steve
  • 2 Post By macmikeman
  • 1 Post By Semi-Ret Electrician
Reply
 
Thread Tools Display Modes
Old 12-20-2016, 08:12 AM   #1
Senior Member
 
Join Date: May 2015
Location: Parts Unknown
Posts: 2,032
Rewards Points: 572
Default Dimming and LED lighting

Just a reality check. It's my understanding that

* The most common old fashioned dimmers are resistive, and they work fine with incandescent lighting.

* Putting a resistive dimmer ahead of an LED driver is no good.

* Putting a resistive dimmer between an LED driver and the LED light would be OK.

Is it that simple?

http://electrical-engineering-portal...ng-in-the-home
__________________
'You must either conquer and rule or serve and lose, suffer or triumph, be the hammer or the anvil.'
splatz is offline   Reply With Quote
Join Contractor Talk

Join the #1 Electrician Forum Today - It's Totally Free!

ElectricianTalk.com - Are you a Professional Electrical Contractor? If so we invite you to join our community and see what it has to offer. Our site is specifically designed for you and it's the leading place for electricians to meet online. No homeowners asking DIY questions. Just fellow tradesmen who enjoy talking about their business, their trade, and anything else that comes up. No matter what your specialty is you'll find that ElectricianTalk.com is a great community to join. Best of all it's totally free!

Join ElectricianTalk.com - Click Here JOIN FOR FREE


Warning: The topics covered on this site include activities in which there exists the potential for serious injury or death. ElectricianTalk.com DOES NOT guarantee the accuracy or completeness of any information contained on this site. Always use proper safety precaution and reference reliable outside sources before attempting any construction or remodeling task!

Sponsored Links
Advertisement
 
Old 12-20-2016, 12:23 PM   #2
Senior Member
 
Join Date: Nov 2007
Posts: 5,457
Rewards Points: 2,858
Default

I've replaced many bulbs in my home with LED conversions, and they all dim fine with the existing dimmers, except that there's a point at about 15-20% output that you can't go below.
splatz likes this.
LawnGuyLandSparky is offline   Reply With Quote
The Following User Says Thank You to LawnGuyLandSparky For This Useful Post:
splatz (12-20-2016)
Old 12-20-2016, 01:24 PM   #3
Safety Pin Member
 
PlugsAndLights's Avatar
 
Join Date: Jan 2016
Location: Eastern Ontario
Posts: 1,481
Rewards Points: 1,340
Default

https://en.wikipedia.org/wiki/Dimmer
P&L
splatz likes this.
PlugsAndLights is offline   Reply With Quote
The Following 3 Users Say Thank You to PlugsAndLights For This Useful Post:
350X (12-23-2016), chicken steve (12-23-2016), splatz (12-23-2016)
Old 12-23-2016, 01:19 AM   #4
Member
 
V-Dough's Avatar
 
Join Date: Jul 2014
Location: Ontario / Canada
Posts: 98
Rewards Points: 163
Default

No, its not that simple. It all depends on the driver. There are drivers that require electronic low voltage dimmers (trailing edge wave chopping), some work well on regular dimmers (leading edge wave chopping), some don't work on dimmers at all.
As for the low voltage side depending on how LEDs are driven: either constant voltage - dimming is accomplished by lowering voltage, or constant current - dimming works by lowering current. Some of the cheaper LED drivers use PWM dimming - i would not recommend this type. Hopefully that was of some help.
splatz likes this.
V-Dough is offline   Reply With Quote
The Following 3 Users Say Thank You to V-Dough For This Useful Post:
chicken steve (12-23-2016), Semi-Ret Electrician (12-31-2016), splatz (12-23-2016)
Old 12-23-2016, 07:17 AM   #5
motherplucker
 
chicken steve's Avatar
 
Join Date: Mar 2011
Location: the Green Mountain state
Posts: 33,318
Rewards Points: 1,992
Default

All i know is i have to stock LED and non-LED dimmers these days, the specifics of how the triac is configured escapes me.....

ICs Answer the Challenge of Dimming LED Lamps in TRIAC-Driven Circuits

~CS~
splatz likes this.
chicken steve is offline   Reply With Quote
The Following User Says Thank You to chicken steve For This Useful Post:
splatz (12-23-2016)
Old 12-23-2016, 11:29 AM   #6
Senile Member
 
macmikeman's Avatar
 
Join Date: Jan 2007
Location: Honolulu
Posts: 19,930
Rewards Points: 2,196
Default

A symbol printed boldly on the outside of every dimming led package should be made the industry standard. One that easily details a leading or lagging circuit so that it takes all the research and guesswork on our part to match the fixture and lamp to the dimmer. It should be printed right next to the place where they state that the lamp is dimming able. And , similarly , the dimmer boxes should carry the same symbol on the package to notify the buyer which type methodology they employ as well. That way, the stupid homeowners who buy the dimmers and hand em to me will at least have a better chance to match up the stupid device to the lamp .

Before everybody screams, it is done basically the same for color choice- that is prominently displayed on each box of dimmer, why not operational configuration?
arthur and splatz like this.
__________________
“That all changes—starting right here and right now.” Jan. 20 “will be remembered as the day the people became the rulers of this nation again.” Donald Trump

Last edited by macmikeman; 12-23-2016 at 11:32 AM.
macmikeman is online now   Reply With Quote
The Following User Says Thank You to macmikeman For This Useful Post:
splatz (12-23-2016)
Old 12-31-2016, 12:55 PM   #7
Senior Member
 
Semi-Ret Electrician's Avatar
 
Join Date: Nov 2011
Location: Birmingham, Alabama
Posts: 2,986
Rewards Points: 244
Default

150W dimmers seem to work OK on LEDs but 600W dimmers have a problem unless there are about six fixtures or more.

Leviton has a list of what devices are compatible. At the bottom of the list is a disclaimer to test the combinations to determine compatibility.
splatz likes this.
Semi-Ret Electrician is offline   Reply With Quote
The Following User Says Thank You to Semi-Ret Electrician For This Useful Post:
splatz (12-31-2016)
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 04:33 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.1
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Our Pro Sites Network
ContractorTalk.com | DrywallTalk.com | HVACSite.com | PaintTalk.com | PlumbingZone.com | RoofingTalk.com