I would like to be able to control the colour of all B1 lights I have installed in a room. I can switch them all on or off using a scene, but setting them all to the same colour at the same time does not appear to be possible.
Fully agree with this. The functionality is already there to create scenes, I'm sure it won't take that much effort to create a scene that detects it consists of multiple B1 lights and set their colours together. Even if a group had this functionality I believe it would be fine