Help with a template to count all the lights on

Configuration
3 
template:
  - sensor:
      - name: Lights on counter
        state: >-
          {% set exclusions = ['light.office_1', 'light.office_2', 'light.office_3'] %}
          {{ states.light
            | rejectattr('attributes.entity_id', 'defined')
            | rejectattr('entity_id', 'in', exclusions)
            | selectattr('state', 'eq', 'on') | list | count }}
        icon: mdi:lightbulb-group
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