Powerbox OG Flipbox
"The original Powerbox FLIPBOX is an individual light switching modulethat allows an individual ballast to run two separate lights - one at atime - by switching back and forth between each light, at auser-specified interval. Flipboxes have lots of possibilities and savelots of money, when compared to buying new digital ballasts. Doubleproduction without installing additional power circuits and save moneyon ballasts by using one ballast. Hand-built at their Californiafactory, 5 year warranty.
Voltage independent - works with 120 Volt and 240 Volt ballasts. Fits Sunlight Supply style ballasts.
Use one Flipbox per ballast and chain up to 20 individual Flipbox modules together for simultaneous flipping.