I bought a few of them to try them out and I'm disappointed currently. I tried to make them switch temperature automatically through the day, and nothing is working. I've only found people saying that there's no way without custom scripts that attempt to change the temperature continuously, which is very surprising. (I've only done an hour of research and tried around 3 different methods).
Only one of the lights, which uses a dimmer switch, changes automatically, but only if I turn it off and on again.
Other than that, the quality of the light is good.
I've had my Hue setup change through 4 color schemes based on sunrise/sunset and time of day for a good few years now.
I'm not aware of any automagic way to achieve this result. You'll need to use all4hue, which is basically a wrapper app around the Hue API, to set up rules by hand.
Basically, you'll have a set of rules which update a variable based on the time of day. Then use this variable as a condition in every rule that turns on a light, and have another set of rules triggered by changes to this variable when a light is on. Not complicated, just tedious to program as you'll need 4 rules per light(group) for each of these categories.
But the results work with lights that stay on, lights turned on by dimmers, as well as with motion sensors. And most importantly, the entire thing runs on the bridge so no HomeKit needed. Well worth the effort IMO.
The latest version of iOS/HomeKit has 'adaptive lighting'. You select that colour option and it will modify the temperature automatically throughout the day. You have very little manual control over it but sounds like what you might be looking for.
Only one of the lights, which uses a dimmer switch, changes automatically, but only if I turn it off and on again.
Other than that, the quality of the light is good.