50 to 100 par is a wide range? Most carpets require more light than a lta but honestly I am not sure were lta's come from. Some Carpets come from very shallow water. Now it also depends on what we are calling carpets.
When I keep magnificas, gigantas or Haddon's, crispas and malu's I shoot for higher light. Be kind of cool if some people took different par readings for their carpet anemones.