Counts the lights on

Configuration
12

you can optimize that

  value_template: >
    {% set lights = [
      states.light.eetkamer,
      states.light.slaapkamer,
      states.light.voortuin,
      ] %}
    {{ lights | selectattr('state','eq','on') | list | count }}

Then to add a light, all you need to do is add to the list. No need for a huge if statement

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