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OpenRGB 0.9 Released!
(gitlab.com)
The former official Lemmy community for the OpenRGB project. Moved to https://lemmy.today/c/OpenRGB
Official website: https://openrgb.org/
GitLab: https://gitlab.com/CalcProgrammer1/OpenRGB
SP120 looks to have just hub mounted LEDs. It doesn't say on Corsair's site but from the pictures I would guess 4 LEDs per fan. I have ML140 RGB fans in one of my builds and they also have hub mounted LEDs, 4 per fan. You can experiment with changing one LED at a time to see when you no longer see any effect from changing them and figure out the number of LEDs that way as well.
I pretty sure SP120 has 8 LEDs per fan.
Edit: Sorry the pro (3 pack with the controller), has 8
There are different skus.
Here is the link