I'm not sure of the history on this one, but at one point it seems that every Fraternity and Sorority had a lit sign on their house. It seems that most of these are gone, hopefully still around but someplace safe. Do you know the history of your House lit sign? I think OPiO had one as well but I don't have a clear photo.
The idea of a new social sorority in Potsdam began in November of 1984. Lambda Phi Delta was founded February 9, 1985 and recognized by Inter-Sorority Council at SUNY Potsdam in April 1985. The sorority membership dwindled but they were re-established on October 14, 1989. The House folded due to lack of interest in 1992.