Hi Bowa,
I suggest you set the brightness level when you turn the light on, then you control it. If you just turn it on, other factors are affecting the brightness and you don’t know where it’s at.
action:
- action: light.turn_on
target:
entity_id:
- light.kitchen
- light.living_room
data:
brightness: 150
for example
If you want these lights to always be in sync, home assistant would need to be used to change the brightness every time using similar/related logic.
Maybe search for blueprints or other examples that match what you are specifically doing to get a better picture.
Tips on Searching for Answers & Duplicate Topics in the Forum.