Drives RED, BLUE and GREEN color dimmable LEDs. The conversion between luminance and LED power is biased so that change in brightness on range 0…1 is percepted more or less uniformly by a human.
To use the nodes in your project you should have the hendyhinds1/rgb-led library installed. Use the “File → Add Library” menu item in XOD IDE if you don’t have it yet. See Using libraries for more info.