Some cree cobs .quantum boards a 600 cmh light would be great depends on some stuff can u control heat ? If not I'd go with led but all three choices are good. I aim to be at least 40w a square foot 50 is ideal. So u have 16 sq ft so16x40 is 640w and 16x50 is 800w id go with the 630 cmh and get proper ventilation and U would do great in a 4x4 imo.