 Huston visited multiple Army hospitals on the East and West Coasts before deciding upon Mason General Hospital on Brentwood, Long Island.The reasons being that Mason General was the biggest mental health facility on the East Coast, the hospital was located near the Army motion picture production center at Astoria Studio in Queens, New York, and the doctors were very open and receptive to the filming and any psychiatric questions he had.The new title that Huston gave the film, "Let There Be Light", was a reference to Genesis 1