For a rectangular growing area, a linear lamp moving system is preferable. The self-propelled LightRail 3.5 IntelliDrive from Gualala Robotics Inc. is without question the finest linear lamp-mover available The Gualala Robotics Inc. LightRail 3.5 IntelliDrive 6 rpm travels approx. 2 feet per minute and has 0 to 60 second adjustable time delay for pausing the lamp at the ends of its travel, helping to promote even growth from end to end. Being the slower of the two 3.5 IntelliDrives, it is typically used for shorter runs and with lower intensity lights. Drive motor comes with mounting hardware, instructions and a 2 year manufactures warranty. This product does not include the rail.