Merrie Dan Light to whom you responded is as I am descended from Jacob Light who settled in the Conestoga Valley about 30 miles from Lebanon. There is as yet no proven relationship with Johann Peter Light of Light's Fort in Lebanon.
Rev. Francis' genealogy has Henry Light (Peter) the 3rd son of Johann Peter Light. He was Married to Barbara Landis (Boehm) and was born 1728 and died 1806. Children of Henry Peter and Barbara were: Henry Light m. Magdalena Funk David Light m. Mollie Hunsicker John Light m. Fannie Landis (Big) Joseph Light m. 3 times Martin Light m. Barbara Orth Jacob Light m. Magdalena Boehm (owned Jacob Light Brewery)
If you are not familiar with Rev. Francis' work which was done in the 1920s it deals mostly with the geaealogy of the Lebanon Lights. There is a copy at the Lebanon Historical Society and one at Lancaster that I donated in the 80s. Also a modern copy was published a few years ago by: Betty M. Light Behr Rt. 8 Carmel, NY10512
I am certainly no expert on the Light's Fort Lights but they are so numerous you are certain to get good response if you scatter some pertinent messages on the Genforums.