With a blue series switch connected to a fixture with dimmable bulbs:
Turning the light on/off using the switch, or the entity in HA transitions over time, and seems to respect the “transition” time specified in the service call to the light.turn_on service.
If you specify a brightness or brightness_pct it appears the transition specified in the call to the light.turn_on service is ignored, as is the ZHA wide transition time in the ZHA configuration. Changing the remote dimming speed(s) seems to have no effect either.
In both scenarios the light.turn_off service dims at either the default ZHA transition time or the specified transition time, which I guess makes sense since you’re not specifying a brightness with off.
Am I missing something? Is the switch ignoring the transition time, or is HA failing to send it when specifying brightness?