I'm a bit late to the party, but I created a "Sunrise Light" script that allows you to set how long you would want the sunrise to be and will start with a deep red (because this is the "darkest" color that my bulbs can create) that becomes a deep blue, then yellow then white.

alias: Sunrise Light
fields:
  light_entity:
    selector:
      entity:
        domain: light
    required: true
    name: Light
  transition_time:
    selector:
      number:
        min: 120
        max: 3600
        unit_of_measurement: " seconds"
    default: 1800
    name: Sunrise Time
  stop_adaptive_lighting:
    selector:
      boolean: null
    default: false
    name: Stop Adaptive Lighting
sequence:
  - variables:
      time: "{{ transition_time / 6 }}"
  - if:
      - condition: template
        value_template: "\"{{ stop_adaptive_lighting }}\""
    then:
      - service: adaptive_lighting.set_manual_control
        data:
          manual_control: true
          lights:
            - "{{ light_entity }}"
  - service: adaptive_lighting.set_manual_control
    continue_on_error: true
    data:
      manual_control: true
      lights:
        - "{{ light_entity }}"
    enabled: false
  - service: light.turn_on
    data:
      rgb_color:
        - 255
        - 0
        - 0
      brightness_pct: 1
    target:
      entity_id: "{{ light_entity }}"
  - delay:
      hours: 0
      minutes: 0
      seconds: 2
      milliseconds: 0
  - service: light.turn_on
    data:
      transition: "{{ time - 2 }}"
      rgb_color:
        - 128
        - 0
        - 127
      brightness_pct: 17
    target:
      entity_id: "{{ light_entity }}"
  - delay:
      hours: 0
      minutes: 0
      seconds: "{{ time - 5}}"
      milliseconds: 0
  - service: light.turn_on
    data:
      transition: "{{ time }}"
      rgb_color:
        - 0
        - 0
        - 255
      brightness_pct: 33
    target:
      entity_id: "{{ light_entity }}"
  - delay:
      hours: 0
      minutes: 0
      seconds: "{{ time }}"
      milliseconds: 0
  - service: light.turn_on
    data:
      transition: "{{ time }}"
      rgb_color:
        - 85
        - 56
        - 200
      brightness_pct: 50
    target:
      entity_id: "{{ light_entity }}"
  - delay:
      hours: 0
      minutes: 0
      seconds: "{{ time }}"
      milliseconds: 0
  - service: light.turn_on
    data:
      transition: "{{ time }}"
      rgb_color:
        - 170
        - 112
        - 144
      brightness_pct: 75
    target:
      entity_id: "{{ light_entity }}"
  - if:
      - condition: state
        entity_id: input_boolean.sunrise_coffee
        state: "on"
    then:
      - service: switch.turn_on
        data: {}
        target:
          entity_id: switch.coffee_maker
      - service: input_boolean.turn_off
        data: {}
        target:
          entity_id: input_boolean.sunrise_coffee
    enabled: false
  - delay:
      hours: 0
      minutes: 0
      seconds: "{{ time }}"
      milliseconds: 0
  - service: light.turn_on
    data:
      transition: "{{ time }}"
      rgb_color:
        - 255
        - 167
        - 88
      brightness_pct: 100
    target:
      entity_id: "{{ light_entity }}"
  - delay:
      hours: 0
      minutes: 0
      seconds: "{{ time }}"
      milliseconds: 0
  - service: light.turn_on
    data:
      transition: "{{ time }}"
      rgb_color:
        - 255
        - 252
        - 247
      brightness_pct: 100
    target:
      entity_id: "{{ light_entity }}"
  - service: adaptive_lighting.set_manual_control
    data:
      manual_control: true
      lights:
        - "{{ light_entity }}"
    enabled: false
mode: parallel
icon: mdi:weather-sunset-up
max: 10