“Lights out (manufacturing)” on @Wikipedia: “FANUC, the Japanese robotics company, has been operating a “lights out” factory for robots since 2001.[5] Robots are building other robots at a rate of about 50 per 24-hour shift and can run unsupervised for as long as 30 days at a time. “Not only is it lights-out,” says Fanuc vice president Gary Zywiol, “we turn off the air conditioning and heat too.””