And about SK6812 smd led 

The data protocol being used is uni-polar NRZ communication mode. The 24-bit data is transmitted from the controller to DIN of the first element, and if it is accepted it is extracted pixel to pixel. After an internal data latch, the remaining data is passed through the internal amplification circuit and sent out on the DO port to the remaining pixels. The pixel is reset after the end of DIN. Using automatic shaping forwarding technology makes the number of cascaded pixels without signal transmission only limited by signal transmission speed.

        The LED has a low driving voltage (which allows for environmental protection and energy saving), high brightness, scattering angle, good consistency, low power, and long life. The control circuit is integrated in the LED above.

Mechanical Product Size (unit mm):

and  here is some parameters about SK6812.

and  parameter graph: 

Compare with WS2812B, APA102C the advantage of  SK6812.

1, Intelligent reverse connect protection, the power supply reverse connection does not damage the IC.

2, The control circuit and the LED share the only power source.

3, Control circuit and RGB chip are integrated in a package of 5050 components, form a complete control of pixel point.

4, Built-in signal reshaping circuit, after wave reshaping to the next driver, ensure wave-form distortion not accumulate.

5, Built-in electric reset circuit and power lost reset circuit.

6, Each pixel of the three primary color can achieve 256 brightness display, completed 16777216 color full color display, and scan frequency not less than 400Hz/s.

7, Cascading port transmission signal by single line.

8, Any two point the distance more than 5m transmission signal without any increase circuit.

9, When the refresh rate is 30fps, cascade number are not less than1024 points.

10, Send data at speeds of 800Kbps.

11,The color of the light were highly consistent, cost-effective..