The Hydrotek LIGHTSPEED FLIP16 can control 16 lights from 8 ballasts with up to 8 lights on at a time. Designed to work with ballasts of any voltage, these heavy duty controllers are built to last. 8 ballast The Hydrotek LIGHTSPEED FLIP16 can control 16 lights from 8 ballasts with up to 8 lights on at a time. Designed to work with ballasts of any voltage, these heavy duty controllers are built to last. 8 ballast cords on one side and 16 reflector plugs on the other side. Save money by using half as many ballasts!