Single automation for all lights

Configuration
8

Here’s something you may wish to try. It combines the efficiency of a State Trigger with the convenience of a Group. It’s untested with lights so caveat emptor.

Create a State-based Template Sensor that reports the latest light that just turned on. Replace group.my_lights with whatever is the entity_id of your group of lights.

template:
  - sensor:
      - name: Latest Light On
        state: >
          {% set x = expand('group.my_lights') | selectattr('state', 'eq', 'on') | sort(attribute='last_changed', reverse=true) | list %}
          {{ (x[0].entity_id if now() - x[0].last_changed < timedelta(seconds=3) else '') if x | count > 0 else '' }}

Create an automation with a State Trigger that monitors the sensor.

alias: 'TEST: Tell which light bulbs turned on'
description: ''
trigger:
  - platform: state
    entity_id: sensor.latest_light_on
condition:
  - condition: template
    value_template: "{{ trigger.to_state.state != '' }}"
action:
  - variables:
      is_above: '{{ is_state("sun.sun", "above_horizon") }}'
  - service: light.turn_on
    target:
      entity_id: '{{ trigger.to_state.state }}'
    data:
      brightness_pct: 1
      color_temp: '{{ 300 if is_above else 425 }}'
  - delay: '00:00:01'
  - service: light.turn_on
    target:
      entity_id: '{{ trigger.to_state.state }}'
    data:
      transition: 10
      brightness_pct: '{{ 100 if is_above else 50 }}'
  - service: notify.notify
    data:
      message: 'This light was turned on: {{ trigger.to_state.state }}'
mode: parallel
max: 10

As already stated, this is untested with lights so let me know if it works (or not).