Light Rail 3.5 Intelli Drive will give you the control you are looking for. With an adjustable 0-60 second time delay you can "fine tune" the length of delay at each end of your lamp's travel to meet your garden's ever changing needs. If your plants are stretching at the ends, simply increase the delay and your plants will all grow at the same rate.
Simply mount the standard 6' track along the desired area. Then place the drive motor onto the track. The Light Rail 3.5 Intelli Drive is supplied with adjustable switch stops, so the lamp travel can be any length. The standard 6' track may also be extended
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