Powerbox LSM-20 Flipbox
"The FLIPBOX LSM-20 is 10 ballast, 20 light FLIPBOX that allows you torun 20 lights from 10 ballasts. Paired with a DPC-15000, and 10electronic ballasts, you can run 20 lights from just 50 Amps at 240Volts. Convenient single unit with built-in timer allows for completeautomation of switching between 20 lights from 10 ballasts.
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. Hand-built at their California factory, 5 year warranty.