I have a Light family in Pennsylvania that is not connected to the Lebanon Light family about which Moses Light wrote a book. My family was from Perry County, Pa. However one son left Perry County, PA in 1843 and went to Pulaski County, Indiana. I found them in Tippicanoe Township of Pulaski County in the 1850 census. This was David Light who became a Methodist minister. Might these people be connnected with the Light's that you are searching for?