YAML for Home Assistant automation that sets a light transition from any lights.

light_transistion_automation.yaml

alias: 'TEST: Tell which light bulbs turned on'
description: ''
trigger:
  - platform: event
    event_type: state_changed
condition:
  - condition: and
    conditions:
      - condition: template
        value_template: '{{ trigger.event.data.entity_id.split(''.'')[0] == ''light'' }}'
      - condition: template
        value_template: '{{ trigger.event.data.old_state.state == ''off'' }}'
      - condition: template
        value_template: '{{ trigger.event.data.new_state.state == ''on'' }}'
      - condition: state
        entity_id: sun.sun
        state: below_horizon
action:
  - service: light.turn_on
    target:
      entity_id: '{{trigger.event.data.entity_id}}'
    data:
      brightness_pct: 1
      kelvin: 3600
  - delay:
      hours: 0
      minutes: 0
      seconds: 1
      milliseconds: 0
  - service: light.turn_on
    target:
      entity_id: '{{trigger.event.data.entity_id}}'
    data:
      transition: 10
      brightness_pct: 50
  - service: notify.notify
    data:
      message: 'This light was turned on: {{trigger.event.data.entity_id}}'
mode: parallel
max: 10