First, I should note that all lights are functioning well so this is much more of a curiosity question. I have 7 Halo RL56 Zigbee lights in my kitchen and in looking over each device it appears all of them are set up using the same "Generic Zigbee CT Bulb (dev)" driver. What I've noticed however is that 3 of these lights seem to frequently show in the logs reporting their color temperature as in the below example.
Now, while I don't particularly see this as any sort of problem at all I'm not sure I understand why only these three lights are doing this reporting. In my brain I would expect all of them to be giving such reporting periodically since they are all the same and running the same driver. On the other hand, I'm not sure such reporting is necessary as it seems to only be the color temperature, not on/off state or anything. These 3 lights show in the log every minute. The other 4 never say a word.
Try hitting Configure on the device detail page to see if that makes a difference. Also make sure they aren't in use by any apps that might be calling Refresh or something odd like that. You can look at "Events" on the device detail page to see what apps have called commands, if any (look for "command" under "Type," and don't confuse this with what apps woke in response to an event, which is likely most of what you'll see).
I'd also be curious if you see more when debug logging is enabled. I suspect you will, so that won't make your problem better, just show that whatever is happening is happening because data is coming in from the device, and turning off all logging won't stop the (possible) problem, just hide the signs. Normally you'll only see things come in whenever you actually change something on the device (e.g., turn it on or off, adjust level, etc.) or specifically request reports for some reason (e.g., a Refresh), so this seems odd to me.
While that would certainly work it would also mean that I wouldn't see relevant logs such as when a light is turned on/off, the brightness changed, etc. Unfortunately I think those are important so I'm hoping to avoid this approach.
I'll try taking a look at the events and apps and even the debugging angles later today, focusing on just one of the 3 in question. Just for simplicity.
Well I tried using Configure and did see that action show in the log as expected. I continued to see the reporting of CT so next I looked at the Events for that device and there is nothing at all for today (I haven't actually used that particular light today). Looking on the device page for the "In use by" only shows Amazon Alexa, Google Home and 2 dashboards (not current being viewed on any devices).
Next, as you suggested, I turned on the debugging and I captured this from the log.
I figured I'd post an update though I don't truly know exactly what resolved this. I had a brief power blip a few days ago and didn't think much of it beyond the fact that it would be a good idea to get my Hub plugged into my UPS. That evening I was trying to play around with Room Lighting and having a tough go of it as some things just weren't working quite as I thought I was reading here in the community. I then decided to simply reboot the Hub and restore from a backup made prior to my playing around (also prior to the power blip). Since then, these 3 devices are no longer consistently reporting their color temperature. I don't recall if I had actually tried a reboot of the Hub when I first was trying to figure this out so it's entirely possible that was all that was needed.
