Light Rail 3.5 Light Mover 

The first self-propelled and adjustable light track! The Light Rail 3.5 is light-weight and easy to install. It comes with heavy-duty carrier wheels to insure dependability. 

The Light Rail 3.5 light mover is flexible enough for any size grow room. Programmable delay timer can pause the grow light at each end of the track for 0 to 60 seconds to even out light exposure.

It has an instrument grade drive motor which is totally sealed from the environment, running efficiently on only 5 watts. The Light Rail 3.5 carries reflectors weighing up to 50 pounds.

Rail is 6-foot long and comes in 2 sections. Choose either 6 RPM Intelli Drive Motor with travel time between 6 and 7 minutes or 10 RPM Intelli Drive Motor with travel time between 3.5 and 4.5 minutes.

Light Rail 3.5 options:

3-foot Extension Rail: Extends 6-foot Light Rail kit to 9-foot

Add-A-Lamp Kit: Includes additional 6' rail, pushrod, trolley and hardware. Can handle 2 HID lights covering up to a 12-foot span

Robo-Stick Lamp Stabilizer: Adjustable lamp attaching device positions, balances, and stabilizes HID light

Drive Wheel "O" Ring kit: Replacement black rubber wheel, tension spring, and bolt

Trolley Wheel Replacement kit: Includes 4 small white wheels and 4 screws

Slide Nut with Thumb Screws: Replacement screw with thumb nut

Carries a 2-year warranty.

More info from the Manufacturer (PDF format - Lots of detail.)