I know that Greg Smith and Marsha Chance of Environmental Services, Inc. did
some archaeological work at the St. Augustine, FL lighthouse a couple of
years ago.  I'm not sure they are list members but you could try reaching
them here:

                Environmental Services, Inc.
                8711 Perimeter Park Blvd., Suite 11
                Jacksonville, FL 32216
                (904)645-9900

I think they have email, but I don't know the address.  I also understand
that there is a non-profit archaeological group, primarily underwater, now
based at that lighthouse and conducting a variety of coastal area
studies--those studies may include other lighthouses.  You might be able to
get information through one of the St. Augustine, FL web pages, since the
lighthouse is open to the public as a tourist attraction.

                Lucy Wayne