Automation to turn on LED TV Ambient lights

I have a Samsung un65h7150 which is I believe is not supported by the Samsung integration, a Roku and a Harmony Hub. I thought I could use the harmony hub but i don’t see any way to get notification of events from the remote and the roku integration looks the same. Any one have an idea how I can have the LED lights turn on and off with the TV (only after sunset)?

I use activity sensor to detect what activity is currently set up by harmony and then perform some automations based on state of this sensor (use it as trigger).
Here is the code for sensor (obviously to be adjusted to your activities):

sensor:
  - platform: template
      tv_room_harmony_activity:
          value_template: >-
            {% if is_state("remote.tv_room", 'on') %}
              {{ states.remote.tv_room.attributes.current_activity }}
            {% else %}
              PowerOff
            {% endif %}
          friendly_name: TV Room Harmony Status
          icon_template: >-
            {% if is_state_attr('remote.tv_room', 'current_activity', 'Watch Apple TV') %}
              mdi:apple
            {% elif is_state_attr('remote.tv_room', 'current_activity', 'Watch Cable TV') %}
              mdi:television
            {% elif is_state_attr('remote.tv_room', 'current_activity', 'Watch Smart TV') %}
              mdi:television-play
            {% elif is_state_attr('remote.tv_room', 'current_activity', 'Play a Game') %}
              mdi:gamepad-variant
            {% elif is_state_attr('remote.tv_room', 'current_activity', 'Watch Blu-Ray') %}
              mdi:disc-player
            {% else %}
              mdi:power
            {% endif %}

And here is sample automation controlling ambient lighting in my TV room:

automation:
  - alias: "Turn down lights on TV Power On"
    initial_state: true
    trigger:
      platform: state
      entity_id: sensor.tv_room_harmony_activity
      from: 'PowerOff'
    condition:
      - condition: state
        entity_id: light.tv_illumination
        state: 'on'
      - condition: state
        entity_id: light.tv_room_main
        state: 'on'
    action:
      - service: light.turn_on
        data:
          entity_id:
            - light.tv_illumination
            - light.desk_lamp
            - light.shelf_illumination
            - light.tv_room_main
          transition: 10
          brightness: 1
      - service: light.turn_on
        data:
          entity_id:
            - light.shelf_illumination
            - light.desk_lamp
            - light.tv_room_main
          brightness: 0
          transition: 1

Again tailored to my particular setup, but should give you an idea how things works.