1 Ballast 2 Lights
A typical flowering room has lights running for only 12 hours per day. When the lights go off, the ballasts sit idle for 12 hours. By adding a Flipbox to the equation, when the first cycle ends, the ballast output is switched to another set of lights in a second bloom room, so you can keep growing 24/7.
Double your light output with the same number of ballasts, on the same electrical circuit(s). Using a Flipbox saves money on ballasts, doubles your harvests, increases your yields, and lets you avoid bringing in additional power circuits to run more ballasts.