Indeed - ZigBee is quite good for this. I know from experience that a Philips Hue bridge will gladly pair with and manage non-Philips bulbs (e.g. I have some IK

Indeed - ZigBee is quite good for this. I know from experience that a Philips Hue bridge will gladly pair with and manage non-Philips bulbs (e.g. I have some IKEA ones in addition to Hue), and similarly that Philips bulbs work fine with a non-Philips bridge. You can also block the Hue bridge's access to the Internet and it continues to work fine.