3 years ago I was growing in a 1000x1000cm (3x3 feet) tent with 8 CXB3590 3500K Cob´s at 1750 milliamperes each. A total of 492 watts, and 45.7 W/sqf.
I have been reading up, and strip-builds and "quantum boards" seem to be what people are using now. Most prebuilt lamps seem to be using white...