The Gavita Slim Line 2 (SL2) fixture includes the HR96 Reflector for maximum efficiency and uniformity, designed specifically with broad light dispersion in mind. This commercial style fixture features highly efficient passive ballast cooling that helps contribute to long fixture life. Other features include sealed housing with a Gore-Tex? ventilation plug, and controllable output up to 1150 W. The Gavita SL2 also features a dimming knob, so growers can manually adjust the light output to meet plants? changing needs. The SL2 is equipped with a Repeater Bus interface. This double-port connection enables control of the SL2 with a Gavita EL Controller (sold separately). Connect up to 100 fixtures in a single daisy chain series, up to five daisy chains per EL controller output. A single EL controller output can control up to five 100-fixture daisy chains, giving you room to grow.