Change range of a dimmer for a light bulb

Configuration
6

Ok, gotcha. So you might be able to use a Template Light for this. Basically you create a new light entity (light.scaled_light) that you would use directly, and it acts on the “real” light the way you define. Something like:

light:
  - platform: template
    lights:
      scaled_light:
        level_template: >
          {% if is_state('light.real_light', 'on') %}
            {{ ((state_attr('light.real_light', 'brightness')|float-255*0.6)/0.4)|round }}
          {% else %}
            0
          {% endif %}
        turn_on:
          service: light.turn_on
          entity_id: light.real_light
        turn_off:
          service: light.turn_off
          entity_id: light.real_light
        set_level:
          service: light.turn_on
          entity_id: light.real_light
          data_template:
            brightness: "{{ (brightness|float*0.4 + 255*0.6)|int }}"
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