Currently, the notification LED strip supports setting color according to a 0-255 hue value on parameter 13. It seems there’s no support for color saturation.
Why’s that? I’d love to be able to represent the color of a light group with the notification LED by sending it an xy color coordinate or a hex color. Without saturation control, the available color depth is very limited.
It looks like this was discussed some time ago, but that’s about all I could find on the subject.