Powerbox LSM-12 Flipbox
"FLIPBOX LSM-12 is 6 ballast, 12 light FLIPBOX that allows you to run12 lights from 6 ballasts. The FLIPBOX LSM-12 has a built-in digitaltimer with battery backup to allow for complete automation of switchingbetween 12 lights from 6 ballasts. Hand-built at their Californiafactory, 5 year warranty.
Voltage independent - works with 120 Volt and 240 Volt ballasts. Fits Sunlight Supply style ballasts.
Detachable trigger cord can override the built-in timer, so Powerbox can be controlled by your own timer, or other devices.
Double production without installing additional power circuits and saves money on ballasts, use 6 ballasts to run 12 lights.