Gavita professional commercial lighting is the best-in-class lighting fixture for growers in greenhouse and indoor environments. For state-of-the-art connectivity combine any Gavita E-Series ballast or fixture with Gavita Master Controller EL1 or EL2 to control 40 or 80 lights respectively, with one simple to use digital controller. Use the ECM1 (120v) and ECM2 (240v) to act as relays for any other equipment you want to turn on and off with your light cycle.