It exist some WS2811 based solutions for powerpixel. From 1W to 100W RGB is all kind aviable.
But I found nothing similar for RGBW.
Next point is the poor length and stability for datawire from controller to LED and from LED to LED and levelshift.
So i will build my own solution 
WS2814 is your friend. In addition with RS485 driver. RS485 is designed for distances from some 100 meters. I tried 5 meter from WEMOS D1 to pixel and 5 meter from pixel to WS2814 stripe. It’s no problem and very stable no flicker or colorsparkle
The 3,3V rail from WEMOS is the supply for a 3485, the 3,3V version from RS485 busdriver
this is my first test and development on breadboard. I’ve cascaded 3x WS2814. the second is the powerdriver. It drives over 4 pnp transistors 4 switched current LED Driver what powered a CREE MC-E Power-LED.
2x 5V RS485 driver translate from bus to pixel and reverse. This solution is also a levelshifter from ESP8266 
this is the driver from RS485 to Dataline for stripe
this is the schematic
PCB’s are in production. I’s a set of 2 round pcb’s with 70mm diameter. It’s a sandwich. First board is for electronic and second board is for screwterminals. If the pcb’s are errorfree I will show it here 
So i’ve developed this project a bit further 
This is the PCB with WS2814, 4 step down current sinks 700 mA, 2 RS485 transciver (in & outside), a 7805 switcher replacement, a sockled fuse and a 26V TVS diode
the connectors are on a second PCB as sandwich mouted
this is a complett lamp
In this lamps works RGBW CREE MC-E LEDs, its a bit oldfashioned but in my stock 
For powerdistribution I use a 24V 150W Meanwell PSU. 7 Spots use 1 Amp (one Chip, 7 lamps 100% power). This matched with 3W p. LED plus switcher losses.
A thrid PCB with ESP controller is ongoing 
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Hey Superluminal, Thanks for the inspiration! I’ve been working on a high power RGBW pixel project myself and I’ve also found that there isn’t really any WS28xx compatible solution available 
Do you have any plans on selling any of the boards you’ve made or would you be willing to post a higher resolution picture of the schematic that you made?
Thanks for your interest 
How can I help you?
I work with Eagle 7.7, I can send you the native Eagle files *.sch (schematic) and brd (board). Also I have the gerber files for PCB production.
I hope, that this png is able, to read 
for other other compartible constant current switcher ICs maybe nessecary to decrease the 15K resistors. For more current decrease the 0,33 Ohm resistors (U= 0,1V)
If you could send me the .sch and .brd files that would be fantastic! I use Eagle as well and I was thinking of changing the footprint of the board a bit to get it to fit inside a housing I’m using
PowerPixel.zip (185.5 KB)
Here is all bundled in a zip-file
Inside is a notice.txt file with some notes.
If you have further questions, please feel free 
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