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Author Topic: LED flicker?  (Read 8092 times)

Jeffhtg (Jeff Kenney)

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Re: LED flicker?
« Reply #10 on: February 20, 2013, 12:59:19 am »

A terminator is required by the spec. If it works without one, you are lucky but you have not changed the fact that DMX requires a terminator.

Don't give bad advice!


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that may be so in the 70's but modern dmx stuff typically self terminates
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Josh Daws

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Re: LED flicker?
« Reply #11 on: February 20, 2013, 09:52:56 am »

A terminator is required by the spec. If it works without one, you are lucky but you have not changed the fact that DMX requires a terminator.

Don't give bad advice!


Sent from my iPad using Tapatalk HD

im not..just honest advice from experience. if i read a lot of manuals in the troubleshooting sections and only is it there mentioned IF having problems with DMX related issues. i have not seen in a manual that says YOU MUST USE A DMX TERMINATOR or this fixture wont work. therefore is not a spec.

As i said...they are not required, but are a good thing to have if having DMX issues, which is more commonly going to be a cable.

in a lot of my gigs(i will keep this to the last 12 months) i have may have only used a DMX terminator once. and never had an issue. and on any one of my shows i will have 4 different fixture types, and at least 6 of one type.

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chris johnson

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Re: LED flicker?
« Reply #12 on: February 23, 2013, 10:21:29 pm »

so i am having flickering light problems myself, and am also in the process of cleaning up my runs and organizing everything and all that. what would be a proper order for troubleshooting my leds to determine exactly what is causing them to flicker? after asking a lot of touring light guys, they think that the problem lies in
1. my fixtures.
2. the fact that i only have one dmx run for everything.
3. the dmx run is fairly long.
4. xlr. not actual dmx.
5. no opto splitter.

my plan is to replace all the cabling with dmx cable, and to send my dmx run to side of stage, and then split it off to its various areas from there from the opto splitter. besides replacing the fixtures, and i missing anything obvious? someone also mentioned the possibility that my lighting console is programmed shitty, and is sending bad data to the lights.

any other ideas? or am i on the right track?
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Josh Daws

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Re: LED flicker?
« Reply #13 on: February 24, 2013, 04:27:29 pm »

i personally think you are on the right track.

the first thing is that you should always use DMX cable not MIC cable for data. there is a specific difference in the impedance capabilities of cables. and since you sending a digital signal you need this cable.

secondly an opto for example, microh dmx splitter, is a great help, it completely isolates the building ground from the DMX ground, so if there is any issues electrically, then theoretically this will protect your equipment. and also acts as a booster.

having one dmx run is an unlikely issue.and same as the console (although not unheard of).

more than likely it is the cabling or the fixtures, however you can try a terminator. it could help.
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John Lopez

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Re: LED flicker?
« Reply #14 on: February 25, 2013, 12:11:30 pm »

New to this forum... plans is to help shed some light. :)
1.
DMX = Digital multi plex.. in order for communication to work at its best you must use 110-120ohm cable.. this helps transmit digital signal.
microphone cable is 80ohms.. so your most expensive microphone cable will create interference problems. Get yourself some DMX data cable.
2.
There is actually a fixture limit even with DMX cable, the rule of thumb is no more than 20 fixtures.. This is where a data splitter or DMX branch is a huge benefit to eliminate data glitches.
If using the proper data transfer components data glitches go away.
DMX Terminator is only an option when problems occur but it will not fix bad glitches if your data line is just really bad with microphone cables and no dmx branch 4.
Keep in mind there really is no problem using microphone cable with short runs of 4 fixtures within a 20' radius... its when your going with bigger runs and more fixtures when you see issues.
3. The flicker-free feature on LED pars only refers to flickering on camera.
So if you are recording or broadcasting you must use flicker free led pars otherwise they will strobe on the camera.
Physically flickering without a camera is just a really bad LED fixture.

I mention this because Elation just worked on an inexpensive LED par that has beautiful dimming and no flickering.
The Epar Tri - see video
http://www.elationlighting.com/ProductDetails.aspx?Category=&ItemNumber=1813

Also Elation has a great free DMX-101 handbook.
http://www.elationlighting.com/ProductDetails.aspx?Category=&ItemNumber=1560
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Mike Pyle

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Re: LED flicker?
« Reply #15 on: March 02, 2013, 02:14:15 pm »

IMO the flicker during fades that the OP describes is caused by "stepping" or the incremental change in DMX values during a manual fade. This can be caused by either the fixture or the controller. In some models the incremental value can be changed to deliver a smoother transition with less flicker. That issue is unrelated to the video flicker that others are discussing.
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Re: LED flicker?
« Reply #15 on: March 02, 2013, 02:14:15 pm »


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