128 Square Pixel Nodes v12 Power Injection Needed?

[Michael]

I am building a matrix 32 x 16 = 512 nodes.  I want to run each string using 128 nodes square 12v pixels.  My question, will I need to use power injection? 

Here are the nodes I am using.
http://www.holidaycoro.com/product-p/673.htm

[jnealand]

Maybe,  I run 128 nodes of TM1804 12mm bullets that are now 4 yrs old.  They work fine off of 1 output with power via the controller.  My nodes came from Ray Wu.

[Michael]

I ran some test tonight on one string of 128.  They work, but sometimes, the last 10 don't change color at the right time for a few cycles.  Happens about 5% of the time.  Would that indicate an issue with power?

[ChristmasBug]

From what I have read on this board for every 100+ pixel they say add some power. Now I have not tested this yet because I am waiting on my controller, so basically as stated anything over 100 in the same string use some extra power. I know the board will do over 300 per port but you will still need some extra power..

[danj]

I will be running 120 length matrix columns using WS2811 square nodes.   I checked the lengths and found them to be fine without power injection (powered from the controller outputs)

[Phrog30]

It all depends on the lights. Wire gauge plays a role, distance between nodes, etc. There is no magic number that works no matter what. I've gone 120 without power injection. Actually I've gone more, but then I start to color issues (white becomes pink, etc.). Nodes not changing color at the right time doesn't sound like a power injection problem, more like data. But one way to find out, inject power.

Also, put a meter at the beginning and the end to see your voltage drop.

James

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