For 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. Instrument grade drive motor totally sealed from the environment runs on only 5.5 watts. Self clutch drive design with automatic traction control No Sprockets or Chains Sliding switch stops for adjustable travel distance Heavy duty carrier wheels Travels 2 feet per minute for close plant to lamp tolerances Solid State Advanced Control's fully integrated PCB circuitry with a 0-60 second adjustable time delay. The Light Rail 3.5 Intelli Drive is supplied with adjustable switch stops, so lamp travel can be any length you wish. This is perfect for a start-up size garden through to a full growth garden. The standard 6 foot track may also be extended. The standard 6 foot track does not come with the motor unless you specify in the option below. Light Rail 3.5 comes with a 2 Year Factory Warranty. These Units were either returned to the factory under warrantable conditions or did not meet our strict testing standards after initial production.In either case, they have been repaired, refurbished and tested by experienced factory technicians here at Gualala Robotics Inc.They carry the same 2 year limited warranty as a New Light Rail 3.5 Drive Motor and can be purchased here OnLine* for $152.00 plus freight. Sorry, but supplies are limited, but are replenished, so be sure and check back if we are out today. * Rail (aluminum track) not included, but available separately for $39.95 for 2 meter and $49.95 for 3 meter.