I was successfully able to discover a Cree Connected light with my Mixtile hub. It shows up as “Unknown Light”, but after a minute of figuring things out with the bulb, it works. It uses Zigbee.
I can adjust the brighness, on/off, and “identify” function (make it blink). The app shows Hue and Saturation sliders as well, but this bulb does not support color and these do nothing.
It is one of these: https://creebulb.com/60-watt-replacement-connected-daylight?___store=default