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WS2811/TM1804 Power Usage

Started by TNF250, December 22, 2018, 07:18:19 AM

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Currently I'm running 6000 of the TM1804 nodes purchased from Ray and as I was planning for 2019 I'm looking to purchase 4000 more RGB pixel nodes. Since the WS2811 seams to be the pixel of chose I was about to pull the trigger and place the order.

I then started to compare them to making sure that the WS2811 were the correct ones in my quotation I noticed that the watts used by the 2811 were 3 times more per pixel then the 1804's according to the specs but there is some conflicting information in the description of the "Feature" vs "Specification".

So I begin to wonder is the $200.00 saving in purchasing the WS2811 worth it in the long run with the power supply's and power consumption savings with staying with the TM1804's.

I'm not to worried about mixing the nodes they would be on separate props and the color difference wouldn't be significantly notable. IMO.



Springfield, TN

X-Lights - RPi3 - FPP - Falcon - DLA Lynx


Springfield, TN

X-Lights - RPi3 - FPP - Falcon - DLA Lynx


The TM1809 (not the 1804) chip can be more efficient because a single chip can drive three RGB LEDs. The TM1809 has 9 outputs, not just 3.

What that means is that when powered from 12v it can (with proper design) use fewer regulators and current limiting resistors that just waste power.

But, the chip is a little more expensive and the layout is more complicated than WS2811 so it isn't used much for single pixels (like bullets or squares) but more common in 12v 5050 based strips.
Long time Falcon, FPP and xLights user


So there's the tech answer (and probably explains the color difference too).  I think the color difference IS noticeable and aggravates my OCD but maybe not be significantly as you say.  1804 white is pinkish and 2811 blueish IMO.  In my vid the house outline is 1804 except the columns which are 2811.  As a trained artist I find my old aether IIs to have the truest white in my setup.  All could be tweaked in software of course but who has the time for that...  Also might be alot easier using the 1804 with the rgb wire scheme vs all black.   


Sam, I only have one string of 2811s that are black wire (and I won that in a door prize).  The rest of them are all RGB wire color or RWB.   

I have a bunch of TM1804 which were the first pixels I ever bought and I have not had to replace very many considering that most of them are at least 5 yrs old.  This season I just replaced the ones on my main megatree with WS2811 but only because I was going from a 180 to a 270 config and did not want the color difference.   I'm planning to put those old TM1804s in a pixel matrix for next year.
Jim Nealand
Kennesaw, GA all Falcon controllers, all 12v Master Remote Multisync with Pi and BBB P10 and P5


Jim, you bring up a point I meant to make in that I find like you that my 1804 have held up better than 2811.  Also your point is well taken 2811 is offered in other wire schemes but ones in OP link are all black.  I always thought the same colored ones were cheaper.


Thank you everyone.

I had select the all black wire just to make it simple for me to know when version of node I was working with in the future, for repairs ect, Ray does make it in multi color wire as well.

I have some string that have 150 nodes with our power injection and no issues, maybe this is due to the efficiency of the 1804. I guess I'm going to stay with the 1804. If anything it will keep it constant and easy for me. 
Springfield, TN

X-Lights - RPi3 - FPP - Falcon - DLA Lynx


I have over 11000 tm1804 and it's amazing the reliability over time with them.  I don't know that the specs were ever accurate at Ray Wu ... but it always seemed that the 1804 used half as many amps as the ws2811.   I also prefer the colored wire for splicing in new nodes.   It appears now that the specs on the 1804 from Ray Wu are showing .5 amp per node instead of the .29/.30 of the original tm1804.   Again, i doubt those specs are reliable.  But if the power consumption difference is real then the tm1804 has aged very well.

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