Is there support for the UCS2903IC chipset?
Found some interesting leds which have this inside:
There is now - I’ve added the timings for the UCS2903 to FastLED@master.
I’ll order those led’s right away.
Do you know the performance differences between w2811 and P9813?
The WS2811 chip uses an 800khz data rate, it takes about 30µs to write out one led’s worth of data, while the P9813 has up to a 20Mhz data rate, so ~25x faster, though in actuality the difference will be lower because of a combination of generally running at lower data rates (20Mhz is a theoretical max), and because P9813 writes 32, not 24 bits for each led. Still, though, P9813 is faster - however, personally, I find its data protocol a bit annoying and prefer the APA102.
Other considerations - the WS2811/WS2812 only has a 400hz pwm refresh rate. The P9813 has a 4.5khz refresh rate, while the APA102 has a 20khz pwm refresh rate.