Surely 4, Well, i’ll Try to prevent you from doing that.... hahaha. This is a similar situation I had earlier. Did a soil and hydro in the same space then, one used CMH, HID and LED. The hydro was all LED. Both had UV-B added in flower. Frankly, they were different but each strain of the same varietal SEEMs the same where it counts. BUT, The Yield was better on 4 of the CMH soil combo than 5 of the LED Hydro. Obviously a more scientific approach is needed and your system can easily lend it self to that