Automate multiple lights, but only the ones that are on

Configuration
7

This shouldn’t be necessary, but try it with the lights template defining a variable…

alias: Sun Color Stairs
description: 'Changes the color of light to match the sun'
trigger:
  - platform: time_pattern
    minutes: '/5'
condition:
  - condition: state
    entity_id: group.circadian_lights
    state: 'on'
action:
  - service: light.turn_on
    data_template:
      color_temp: |
        {{ (states('sensor.circadian_light') | int) }}
    target:
      entity_id: '{{active_lights}}'
mode: single
variables:
  active_lights: |
    {{ expand('group.circadian_lights') | selectattr('state', 'eq', 'on') | map(attribute = 'entity_id') | list }}

EDITED to address typo in template