Look in the manual of the bulb how to set the bulb in exclusion mode and then go the Homey app and go to Settings -> Z-wave -> Remove a z-wave device.
After that re-add the bulb
Look in the manual of the bulb how to set the bulb in exclusion mode and then go the Homey app and go to Settings -> Z-wave -> Remove a z-wave device.
After that re-add the bulb