The Sun System® Rail System (RS) 1850 LED is a 6 rail, foldable LED producing 1850 μmol/s with an efficiency of 2.5 μmol/j. This fixture is DLC listed, IP65 wet-rated, and comes complete with a manual digital dimming button and an internal embedded smart controller that is compatible with the Gavita e-Series Controller (required to operate; sold separately). Together, these features give you the ability to control up to 500 fixtures. The Sun System RS 1850 utilizes top-bin Sun System-brand diodes to produce a full-spectrum light source. Use in greenhouses or climate rooms. The RS 1850 operates at 120-277 volt.