Yeah I have done that before with JLCPCB, but only tht componets soldered by myself.
But I have the advantage that my company is the leading producer of Reflow soldering ovens so the LEDs should be no Problem
There you go. So it'll be a little quality test run of your ovens in other words 
Well, I'll do another test run of the ol' bed here
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- Is this for a miniature or full size area ?
Area?
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How long will the LED string be, how high from floor ?
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WS2812b LED strings are quite bright at 6 feet.
I Cant use a traditional Strip.
It will be on the ground, not lighting up a surface, it just needs to be visible as best as possible without blinding traffic.
20m Long with 40 LEDs so 2LEDs per Meter
As a sort of guidance for drivers where to go
Google (actually Bing, which Is Not Google), shows Adafruit has addressable LEDs in high wattages: Ultra Bright 4 Watt Chainable RGBW NeoPixel LED - Cool White [~6000K] : ID 5162 : Adafruit Industries, Unique & fun DIY electronics and kits
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*Please note: these are high power LEDs, you need a strong 5V power supply that can provide at least 1/2 A per LED
Is in the discription of the LEDs
Wich means i put my Powersupply on the Vcc, with my data line coming from the arduino
and my Ground being common between the two
So this would be the curcuit Diagramm for a pair of 3 LEDs
Can i Put all LEDs on OUTR of the WS2811 and still control them seperatly or do need to put one on OUTB one on OUTG and one on OUTR
What LEDs do you have?
these ones
QLSP04PCAU
I found them, I didn't read the entire thread before. My mistake
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small correction, now with the individual PCBs seperated with connectors in between them for soldering wires onthere
Hi, @moax8898
Welcome to the forum.
What exactly is your application?
What does your project do?
Thanks... Tom.... 
50 x 350 mA = 17,5 A
At 5 V you're gonna need some thick wires. Where will you inject? At one end, two ends or the middle), both ends and middle?
One more thing, is there a possibility that people will walk over the installation, or tires run over?
ideally i would inject only on one end.
You think 1,5mm² would be enough or should i use 2,5mm²?
Tires and feet could happen but really only in a worst case scenario, so shouldnt be a problem
actually now that i think about it the middle would also be a possibility, so 10m in each direction
No. To both mm². You will get voltage drop, especially if you power the strip from one end only. Ideally, you would use a higher voltage, with PWM. (That's why the MOSFETs are there for anyway).
Lets see if there's a calculator out there.
Not to sure why you would want to use an LED driver to control a MOSFET switch but you do need to use all 3 outputs AND they must be pulled-up to 5V.
The logic will be inverted.
You should also have a bypass cap on Vdd and series resistor in the data line.
So a MOSFET can be used to regulate Voltage?