Home Assistant Sync Brightness Blueprint

light-sync-brightness.yaml

blueprint:
  name: Light Brightness Sync
  description: Sync on-off-state and brightness between a mirror and a reference lamp
  domain: automation
  input:
    reference:
      name: Reference
      description: This light will be referenced
      selector:
        entity:
          domain: light
    mirror:
      name: Mirror
      description: This light will mirror the Reference
      selector:
        entity:
          domain: light

variables:
  reference_entity: !input reference
  mirror_entity: !input mirror

triggers:
  - trigger: state
    entity_id: !input reference

actions:
  - choose:
      - conditions:
          - condition: state
            entity_id: !input reference
            state: "off"
        sequence:
          - action: light.turn_off
            target:
              entity_id: !input mirror
      
      - conditions:
          - condition: state
            entity_id: !input reference
            state: "on"
        sequence:
          - choose:
              - conditions: []
                sequence:
                  - action: light.turn_on
                    target:
                      entity_id: !input mirror
                    data:
                      brightness: "{{ state_attr(reference_entity, 'brightness') }}"
mode: restart