More than happy to help with my input.
Like, what does the LED display if there are 3 bulbs attached and one is at 33%, one at 45%, and one at 99%?
I would look for the “mean” of all bulbs, so (33+45+99)/3 = 59
How does z-wave switch know what the level is for a zigbee bulb or a wifi bulb? What if the bulbs aren’t even attached to this load, but it is just being used as a scene controller?
This I can see as being a challenge, but you should only be worried about functionality of z-wave to z-wave stuff that is associated.
For other (zigbee, wifi, etc) I would basically look for a second setLevel command (barLevel?) of the switch that would be in the DTH that I could essentially overwrite the LED “height” and intensity. I would basically send the command from the switch being tapped down (off) to set the bulb and the bar level to 0 (which would then go to “off” state of solid 10% intensity).
What happens if two of the bulbs are turned off but one of them is on? Does the LED bar stay on or go off?
Again, the mean of the 3 is 33% (assuming (0+0+99)/3 is the evaluated mean). It should be on, but representing a level of 33% as there is 33% of the possible light being utilized from that switch.
These are just a few examples that are involved in engineering this feature, but one that we are working on.
Can’t wait!