LightRail 3.5 IntelliDrive Kit, Light Mover Grow Light System: Our most popular light mover, LightRail 3.5 will turn your indoor grow lights into robotic lights. And, this grow light system will move an indoor grow light approximately 4 feet per minute (1.2 meters). Also, this grow light mover has a 0 to 60 second adjustable time delay for pausing the indoor grow light at both ends of its travels. So, this helps our grow equipment by promoting even growth from end to end. And, it allows for equal light-time for the entire run.