Loop - flash

      - service: light.turn_on
        data:
          entity_id: "{{ light }}"
      - repeat:
          count: 4
          sequence:
            - delay:
                milliseconds: 500
            - service: light.turn_off
              data:
                entity_id: "{{ light }}"
            - service: light.turn_on
              data:
                entity_id: "{{ light }}"