LightRail 3.5 IntelliDrive 10 RPM KitFor a rectangular growing area, a linear lamp moving system is preferable. The self propelled Light Rail 3. 5 Intelli Drive is without question the finest linear lamp mover available. It uses no pulleys, chains or gears. Simply mount the standard 6 foot track over the desired area and place the lamp moving drive motor onto the track. The Light Rail 3. 5 Intelli Drive is supplied with adjustable switch stops, so lamp travel can be any length you wish.