The Light Rail 3.5 has the ability to move 1 light 6 feet, or up to 12' with the optional extension rail. An adjustable delay (1-60 seconds) at each end evens out the light coverage. Two models are available, 6 RPM and 10 RPM. The 6 RPM takes about 4 minutes to travel across the rail and the 10 RPM takes about 2 minutes. All Light Rails include a single point mounting hook for your light, a 6 foot rail, and adjustable end stops. 3 and 6 foot extension rails are available for larger coverage. The Add-a-Lamp kit is available which allows you to move 2 lights with one motor along one long rail (up to 12 feet). The Add-a-Lamp kit Includes a 6' rail, trolly, and attachment bar. The "Robo-Stik" reflector mount allows for 2 point mounting for your reflector. Highly recommended.