The Lights Out show ran for 12 years on radio, but although the television version was critically acclaimed, it oly lasted for three years. Each episode was presented 'live' and you may see mistakes in dialogue or choppy action. They usually had two nearby sets, and one camera at each set to transmit the picture live to the network. These episodes have been preserved via Kinescope technology. Before video tape the only way to preserve live action was with movie film, so during the live telecast, offstage there would be a large television set with the live show displayed on it. Aimed at the television set would be a movie camera, which would record the show, and after the film was developed, they would have an accurate copy of the show. The quality was not great, because it was limited by the quality of the television screen.