This revolutionary flippable, dimmable digital ballast is a premiere choice for your indoor garden. The Nanolux Flip NN1000FD can be used as a single (no flip) ballast or used with dual lamps (not simultaneously), in flip mode. Lamp outputs are controlled with the use of an external timer (sold separately). Operates metal halide or high pressure sodium lamps. The Nanolux Flip ballast utilizes the latest "Nano-Alter" digital technology allowing the operation of two reflectors and two lamps with one ballast. This ballast utilizes an LED notification system, allowing the user to easily diagnose problems such as fan failure, under or over voltage, and thermal overload protection. Customize your light output between 100, 75, and 50 percent. The Nanolux Flip features energy-savings up to 30 percent, compared with magnetic ballasts, and runs 20 percent cooler than other digital ballasts on the market.