4 Smart bulbs in one fixture - control as one?

In the US (@anon36505037 is in the UK, which is why I keep specifying) Another option would be the Homeseer switch. This looks just like a regular rocker, but it allows for single tap, double tap, and triple tap for both on and for off. These are popular for zone lighting, such as single tap for the entire room, double tap for one zone and triple tap for a different zone.

The problem is that you have to remember the zone patterns, and guests can get confused. That’s why most people use the single tap for the entire room, so guests will find it simple.