Swiching lights in 2 rooms

I want to make 2 rooms with 4 hps lamps in each room, then swiching the lights under bloom. 12/12...lights will be on 24h
Anybody know where to buy a swich for that???

Need some help!

 

A swich is a box that let u go from 1 to 2 without any energy dip. I has to give energy to room 1 and then directly to room 2 (when u switch). A timer setup would be complicated and not relyable.

I was thinking to make a double room for blomming (lights on 24 h)
/caravelas

 

Thanks for the info!