I found out what "Light in the Hills" was. There is a religious retreat in eastern Kentucky called Camp Nathanael; it caters to all groups but especially to Lexington-area teenagers who go there for a week in the summer. "Light in the Hills" is the name of the newsletter put out by Camp Nathanael and is also the name of a daily radio show heard on several stations in eastern Kentucky. In the '70s it put on the television show carried on Friday nights by Channel 57 in Hazard. Beyond that, I don't who the personnel were on the program.