Homeassistant Blueprint - Directional Light Bonding with Brightness Sync

directional_bond.yaml

blueprint:
  name: Directional Light Bonding with Brightness Sync
  description: Bind light entity B to entity A's state
  domain: automation
  input:
    light_1:
      name: Controller Light A
      selector:
        entity:
          domain: light
          
    light_2:
      name: Slave Light B
      selector:
        entity:
          domain: light
      
trigger:
- entity_id:
  - !input light_1
  platform: state
- entity_id:
  - !input light_1
  platform: state
  attribute: brightness
action:
- entity_id:
  - !input light_2
  service: '{% if trigger.to_state.state == "on" %} light.turn_on {% elif trigger.to_state.state == "off" %} light.turn_off {% endif %}'
- entity_id:
  - !input light_2
  condition: state
  state: 'on'
- service: light.turn_on
  data:
    brightness: '{{ trigger.to_state.attributes.brightness }}'
  entity_id:
    - !input light_2