Combining single RGBW channels into one light

Configuration
10

I’ve now found a way to solve this. I created a mqtt_json light, which is listening to a dummy topic. This will probably also work with other lights, but mqtt_json supports RGB and white channel:

- platform: mqtt_json
  name: wohnzimmer_strip
  brightness: true
  rgb: true
  command_topic: "dummy"
  optimistic: true
  white_value: true

This gives me a dimmable light with a color picker and also a white channel:

image
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With this, I can have automations which forward the state of this light to the individual lights:

- alias: "Wohnzimmer LED Strip Color"
  trigger:
    platform: state
    entity_id: light.wohnzimmer_strip
  condition:
     - condition: state
       entity_id: light.wohnzimmer_strip                                                                                                           state: 'on'
  action:
     - service: light.turn_on
       entity_id: light.wohnzimmer_strip_decke_r
       data_template:
          brightness: "{{ (states.light.wohnzimmer_strip.attributes.rgb_color[0] * (states.light.wohnzimmer_strip.attributes.brightness / 255)) | int  }}"
     - service: light.turn_on
       entity_id: light.wohnzimmer_strip_decke_g
       data_template:
          brightness: "{{ (states.light.wohnzimmer_strip.attributes.rgb_color[1] * (states.light.wohnzimmer_strip.attributes.brightness / 255)) | int  }}"
     - service: light.turn_on
       entity_id: light.wohnzimmer_strip_decke_b
       data_template:
          brightness: "{{ (states.light.wohnzimmer_strip.attributes.rgb_color[2] * (states.light.wohnzimmer_strip.attributes.brightness / 255)) | int  }}"
     - service: light.turn_on
       entity_id: light.wohnzimmer_strip_decke_w
       data_template:
          brightness: "{{ (states.light.wohnzimmer_strip.attributes.white_value * (states.light.wohnzimmer_strip.attributes.brightness / 255)) | int  }}"

- alias: "Wohnzimmer LED Strip Power"                                                                                                         trigger:
     platform: state
     entity_id: light.wohnzimmer_strip
     to: 'off'
  action:
     - service: light.turn_off
       entity_id: light.wohnzimmer_strip_decke_r
     - service: light.turn_off
       entity_id: light.wohnzimmer_strip_decke_g
     - service: light.turn_off
       entity_id: light.wohnzimmer_strip_decke_b
     - service: light.turn_off
       entity_id: light.wohnzimmer_strip_decke_w

I’d prefer if I could pack everything into one rule, but it seems like the rgb_color attribute is not present when the light is turned off.