The Hydrotek LIGHTSPEED FLIP4 can control 4 lights from 2 ballasts with up to 2 lights on at a time. Designed to work with ballasts of any voltage, these heavy duty controllers are built to last. 2 ballasts. The Hydrotek LIGHTSPEED FLIP4 can control 4 lights from 2 ballasts with up to 2 lights on at a time. Designed to work with ballasts of any voltage, these heavy duty controllers are built to last. 2 ballast cords on one side and 4 reflector plugs on the other side. Save money by using half as many ballasts!