Circadian lighting calculator fit for Scandianvian countries.

automations.yaml

- id: '12345'
  alias: Light - Circadian lights
  description: ''
  trigger:
  - platform: time_pattern
    minutes: /10
  condition:
  - condition: template
    value_template: '{{ states.light|selectattr(''state'',''eq'',''on'')|list|count
      > 0 }}
      '
  action:
  - service: light.turn_on
    data_template:
      color_temp: '{{ states.sensor.colortemp.state }}'
      entity_id: '{{ states.light|selectattr(''state'',''=='',''on'')|rejectattr(''entity_id'',
        ''=='', ''light.GROUPS_OR_LIGHTS_YOU_WANT_TO_EXCLUDE_EVEN_IF_THEY_ARE_ON'')|map(attribute=''entity_id'')|join('','')
        }}
        '
  mode: queued
  max: 25

configuration.yaml

- platform: template
      sensors:
          colortemp:
            friendly_name: 'circadian light - color temperature'
            unit_of_measurement: 'mired'
            value_template: >
             {%if states.sun.sun.attributes.elevation > 0%}
             {%set nightlenPow = ((as_timestamp(states.sun.sun.attributes.next_rising) - as_timestamp(states.sun.sun.attributes.next_setting)) / 3600 / 24)**1.6 %}
             {%set altitudefactor = states.sun.sun.attributes.elevation * nightlenPow%}
             {{ (450 - (altitudefactor * 44))|int}}
             {%else%}
             {{450}}
             {%endif%}