def lights
      if tag
        context.all_lights.select { |l| l.tags.include?(tag) }
      else
        context.all_lights
      end
    end
def lights
      if tag
        context.all_lights.select { |l| l.tags.include?(tag) }
      else
        context.all_lights
      end
    end
Returns an Array of {Light}s
 @return [Array<Light>]