The Hydrotek LIGHTSPEED FLIP8 is an automated 4 ballast, 8 light switching unit which allows you to run 8 lights from 4 ballasts. These units work with ballasts plugged into any voltage. Heavy duty and built to last, they can be used with any 120V timer. Save money on your ballasts - use 4 ballasts to run 8 lights! Optional 240V timer outlet. Made in Canada.