10 RPM Kit. Rail & motor kit in one box - box dimensions: 41” x 6” x 5”. For a rectangular growing area, a linear lamp moving system is preferable. The self propelled Light Rail is mounted on the standard 6 foot track over the desired area. The standard 6-foot track may also be extended. By moving your lights back & forth across your growing area with a light mover you increase your coverage area! These motors offer a 0 - 60 second time delay. Two year warranty.