The LF series Ballast Switching Controller allows you to expand your growing area without having to increase power requirements or purchase additional ballasts. All you need is an additional Reflector and Bulb for each ballast in your system. Expand your growing area without increasing power requirements. Double your yields! Use 2 or 4 bulbs on one ballast! (not simultaneously) Maximize available power by using all 24 hours of the day! Run lights in several different staggered configurations. Saves energy by using less ballasts! No need to run additional power circuits. Works with magnetic core and digital ballasts. Plug and play with most popular lighting systems. Piggyback Trigger cable allows daisy chaining additional controllers. Available in 2,4,6,8,10,20 ballast configurations. Heavy duty aluminum chassis won't rust. Made in the USA! ETL Listed Five year hassle free warranty!