I was looking for a smart bulb that has the ability to change the color temp and dim. I have one sign me bulb eco smart brand that I found at Home Depot. It’s zigbee changes color temp and dims. So far this has been the best bulb I have. I use it and the adaptive lighting. I’m able to smoothly fade the light on and off. The other bulb is a singled bulb that only dims but the fading is a bit jerky. I have not been able to find any of the ecosmart zigbee bulbs. Can anyone recommend ones that would be similar to what I have explained with the ecosmart brand?
Not sure if this will fit your smoothness requirements, however the developer is very responsive 
and you may have more ability to configure in comparison to zigbee interfaced devices. Good hunting!
I’ll have to look into this. I tend to stay away from WiFi since for some reason my 2.4G signal is being interfered I think since anything on that band is extremely slow. I have a mesh WiFi setup and mainly use 5G band when ever possible with no issues. Maybe it’s all my zigbee devices causing this issue?
What I find interesting about these Kauf bulbs is that they are relative low cost and hackable around ideas in RGBCW lighting. I have been told I am way overthinking it, but the ideas of color temperature and circadian rhythms are interesting. Yes the 2.4 GHz band can be a challenge, and tough to peer into without expensive tools. Unfortunately due to the reality of the ‘transport choice’ the vendor of a home assistant device makes, I find that having a mix of devices communicating using zigbee, bluetooth and wifi is what it is if you want useful automated home. Frustrating and expensive. Having a home wide adaptive lighting system is a good example of what makes home automation interesting. Good hunting!