LightRail 3.5 Motor only with Switch Stop stoppers, Light Mover grow Light System: The LightRail 3.5 IntelliDrive Motor is our most popular light mover. And, it travels approximately 4 feet per minute (1.2 meters). Also, this grow light mover has a 0 to 60 second adjustable time delay. That grow equipment feature is for pausing the indoor grow light at both ends of its travels. So, this helps to promote even growth from end to end.