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Thread: LED "Shunt" for Full Dimming

  1. #1
    Rebuilding for 2017 :-) kidcole's Avatar
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    Default LED "Shunt" for Full Dimming

    In case some of you don't get the online Planet Christmas monthly magazine, here's a great trick I just read on this month's issue.

    Of course you must still have the Dimmable type of LED bulbs. And that topic has been warn over and over on this site (and many others), so I won't go into that. But even with the dimmable LEDs, they still cut off at about 35% dimming level.

    The trick is to add a shunt C7 incondescent bulb to each circuit (channel). That lets the LEDs dim all the way down. You could probably devise a way to black it out, or maybe it will work the same if you put the shunt bulbs right at the controller outputs. Except for my Mega-tree, this would put them all in my garage.

    Happy Dimming !
    Thanks,

    Denny Cole
    https://www.facebook.com/groups/Cole...ristmasLights/

    Moving to Xlights for 2017 !

    Falcon - 2 F16V3 & 1 PiCap, Sandevices - 2 E681 & 4 E6804, 256 Channels Lynx Express, 108 Channels DC DMX,
    10' Pixel MegaTree, CoroFlakes w/Pixel Modules, Pixel RBLs, 2 Pixel Matrix 16x25, 10" RGB Ornaments, 7x230 Pixel Icicle Matrix,
    Classic 20' AC Megatree, TIR Destiny RGB Spots, RGB Blowmolds, Wireframes, and Inflatables with External Light Control

  2. #2
    The Lady In The House! crazylightlady's Avatar
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    Default Re: LED "Shunt" for Full Dimming

    You might want to check out my site. Take a look at Terminators How-To. And please don't take everything you read on PC as anything close to actual usage. The article you referenced has so many half and un-truths I'm almost tempted to write an article for the next PC magazine. Almost tempted, but not tempted enough to put money in someone else's pocket for info I share freely.

  3. #3
    This space for rent. Al in Raleigh's Avatar
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    Default Re: LED "Shunt" for Full Dimming

    For anyone that doesn't already know crazylightlady is commonly known as AnnaLisa and when she isn't blinding herself with high powered LEDs she gives excellent empirical advise on lighting matters. She usually signs her posts with AL not to be confused with me, Al. She learned all that she knows from Richard Holdman.

    Oh, I can see AL's veins pulsating all the way from Texas.

  4. #4
    wbottomley
    Visitor wbottomley's Avatar

    Default Re: LED "Shunt" for Full Dimming

    And, she is one of the most creditable people in this hobby.

    When she speaks... you can take it to the bank.

    I've been good friends with her for years and love her to death!

  5. #5
    Got Nose ? davetv102's Avatar
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    Default Re: LED "Shunt" for Full Dimming

    [quote=Al in Raleigh;2300] She learned all that she knows from Richard Holdman. quote]

    WOW!! I'd hate to be Al right now......... sooner or later she WILL get you for that.
    And on the 8th day, God created Christmas lights.

    240 Channels of DMX

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    Trying to behave here-NOT John's Avatar
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    Default Re: LED "Shunt" for Full Dimming

    [quote=davetv102;2302]
    Quote Originally Posted by Al in Raleigh View Post
    She learned all that she knows from Richard Holdman. quote]

    WOW!! I'd hate to be Al right now......... sooner or later she WILL get you for that.
    Isn't that the truth!!!! Probably at the next Carolina Mini. She has only missed one, due to all the flights out of Dallas being canceled.

    She will beat the tar out of Al with Deb watching !!!
    John (The Mascot)
    www.tennholidays.com

    480 LOR Channels + 2 CCR + 8 Mighty Minis + 10 Rainbow Floods+ 1 vdrive and vflood, Lynx Express and over 40,000 LEDs

  7. #7
    The Lady In The House! crazylightlady's Avatar
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    Default Re: LED "Shunt" for Full Dimming

    You guys kill me!

    Oh and don't forget I learned everything about sequencing from Don!

    Thanks for the laugh!

  8. #8
    Rebuilding for 2017 :-) kidcole's Avatar
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    Default Re: LED "Shunt" for Full Dimming

    Thanks Crazylightlady .. I appreciate the clarifications and the reference to your site! I think they guys must have been hiding you from me! I'm this year's new sponge.

    In all the discussions we've had about LEDs, it was always stated that you can't DIMM LEDs all the way down. So I was pretty exciting to see there was a solution. Nobody here ever said there was a way to smooth out LED DIMMing (until now) ..
    Thanks,

    Denny Cole
    https://www.facebook.com/groups/Cole...ristmasLights/

    Moving to Xlights for 2017 !

    Falcon - 2 F16V3 & 1 PiCap, Sandevices - 2 E681 & 4 E6804, 256 Channels Lynx Express, 108 Channels DC DMX,
    10' Pixel MegaTree, CoroFlakes w/Pixel Modules, Pixel RBLs, 2 Pixel Matrix 16x25, 10" RGB Ornaments, 7x230 Pixel Icicle Matrix,
    Classic 20' AC Megatree, TIR Destiny RGB Spots, RGB Blowmolds, Wireframes, and Inflatables with External Light Control

  9. #9
    God Bless America victory402's Avatar
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    Default Re: LED "Shunt" for Full Dimming

    Hello Annalisa,

    Nice to meet you. Can you post a link to your website?

    Thanks,
    Vic
    RED MOUNTAIN LIGHTS

  10. #10
    Trying to behave here-NOT John's Avatar
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    Default Re: LED "Shunt" for Full Dimming

    Quote Originally Posted by victory402 View Post
    Hello Annalisa,

    Nice to meet you. Can you post a link to your website?

    Thanks,
    Vic
    I'll post it for her Vic

    http://www.crazylightlady.us/
    John (The Mascot)
    www.tennholidays.com

    480 LOR Channels + 2 CCR + 8 Mighty Minis + 10 Rainbow Floods+ 1 vdrive and vflood, Lynx Express and over 40,000 LEDs

  11. #11
    Trying to behave here-NOT John's Avatar
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    Default Re: LED "Shunt" for Full Dimming

    Quote Originally Posted by kidcole View Post
    In all the discussions we've had about LEDs, it was always stated that you can't DIMM LEDs all the way down. So I was pretty exciting to see there was a solution. Nobody here ever said there was a way to smooth out LED DIMMing (until now) ..
    Denny,

    I must have missed the post where you even asked!

    Annalisa is regarded as an "expert". She encouraged me, several years ago, standing in a parking lot, hoisting red cups, that I should start converting my display to all LEDs.

    I only use FWR LEDs and now have over 600 strings for my display. I agree with Annalissa that the PC article was pretty lame as to the quality of information it offered up. Using 320 channels driving LED strings I would have to add 1600 watts of incadescent C7 lights to my display. It ain't gonna happen!

    Using quality FWR LEDs (not the retail kind) decent dimming can be acheived, especially since LOR upgraded the firmware in their controllers several years ago (2006 I believe) to compensate for the different dimming characteristics of the FWR LEDs. This difference does require some adjustments in how you sequence a fade with LEDs as opposed to a string of mini's. But terminators are no longer really necessary. (Retail store LEDs still work better with a terminator, though)

    BTW, most all of my FWR LED strings were from Paul at CDI. A few from Travis, but he shipped stuff I didn't order and only part of what I did order. Paul has 100% of my business from now on!
    Last edited by John; 11-01-2009 at 09:08 AM.
    John (The Mascot)
    www.tennholidays.com

    480 LOR Channels + 2 CCR + 8 Mighty Minis + 10 Rainbow Floods+ 1 vdrive and vflood, Lynx Express and over 40,000 LEDs

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