homeassistant

I personally use the Roku RGB ones that came out last year. It's like $18 for three of them, total house done for under $100 with three bedrooms and all the common areas. They work well and sync to my home automation service, as well as having a geofence option to turn on/off when entering/exiting the general area of the home.

I lived in a sketchy neighborhood prior and those bulbs saved our ass on a few occasions. People would come to the door, cameras would send an alert and all the lights would go on in an instant. This occured multiple times and it worked as a deterrent all of them.

I also have some of the light strips synced together (there is a party mode with them, but unless you want to have a stroke I wouldn't use it) and those create a good cohesive ambiance behind my desk and TV.

I will ding them points for the party mode being hellish, and the app not having a dark mode, but they do sync quickly, reliably, and are user friendly to set up profiles and rules for.

Hope that helps as I seem to be the only one not saying the Ikea ones (I have no experience with them so I cannot recommend something I've never tried)

Edit: I wrote all this up and then decided to look into ZigBee as I realized thats the main concern of OP. I think this fulfills the functional requirements, but maybe not, so I'll leave the comment just in case.