>-

  {%- if is_state('light.all', 'on') -%}
    There are
    {%- for state in states.light if state.state == 'on' -%}
      {% if loop.last %} {{ loop.index }} {% endif %}
    {%- endfor -%}
    lights turned on right now.
  {%- else -%}
    There are no lights turned on right now.
  {%- endif -%}