The all new LightRail 4.0 Adjust-a-Drive is the newest linear light mover available from Gualala Robotics Inc. With both a 0 to 60 second adjustable time delay for promoting even growth from end to end, and a two to four feet per minute adjustable speed that covers a wide range of lamp intensities and travel distances. The all new LightRail 4 AdjustaDrive from Gualala Robotics Inc., designed and manufactured in the USA and is the ultimate in light mover control and is compatible with all LightRail 3.0 and 3.5 rails and accessory items