Copy Light State to Multiple Controlled Devices

light_state_copy.yaml

blueprint:
  name: Controlling Device Sets Controlled Device brightness states
  description: Synchronize the on/off state of 2 entities
  domain: automation
  input:
    controlling_light:
      name: Controlling Light
      selector:
        entity:
          filter:
          - domain:
            - light
          multiple: false
    target_light:
      name: Target Light
      selector:
        entity:
          filter:
          - domain:
            - light
          multiple: true
  source_url: https://gist.github.com/jvmahon/39ca2d1995446b02bc7266bf2678e1b8
mode: restart
max_exceeded: silent
variables:
  entity_1: !input controlling_light
  entity_2: !input target_light
trigger:
- platform: state
  entity_id: !input controlling_light
- platform: state
  entity_id: !input controlling_light
  attribute: brightness
condition: []
action:
  - choose:
      - conditions:
          - condition: state
            entity_id: !input controlling_light
            state: "on"
        sequence:
          - data:
              brightness: |
                {{ state_attr(entity_1, 'brightness') }}
            action: light.turn_on
            target:
              entity_id: !input target_light
      - conditions:
          - condition: state
            entity_id: !input controlling_light
            state: "off"
        sequence:
          - data:
              entity_id: !input target_light
            action: light.turn_off
    default:
      - target:
          entity_id: !input target_light
        action: light.turn_on
        data: {}