Here's the promised followup. The bulbs pair to Hubitat very easily as "Advanced Zigbee Bulb". They do not respond as anticipated with the "Advanced Zigbee RGBW Bulb" driver, but do work fine with the "Generic Zigbee RGBW Light" driver.
The bulbs identify themselves as:
CT ranges from 2700-6500K. The bulbs put out plenty of light in CT mode.
Color reproduction in RGB mode is pretty good - at least as good as Sengled (examples below), but at a level of 100%, the lumens output is about 30-50% of that output in CT mode at 4000K.
@mike.maxwell, if you'd like to add the device fingerprint to the "Generic ZigBee RGBW Light" driver for a future platform release, here it is:
Bottom-line: If I needed cheap zigbee 3.0 rgbw bulbs, I'd get more of these. They seem to play okay with other zigbee devices.
