U would do well to look into acquiring some high efficacy strips. Find a strip with diodes that run at about half an Amp. Add up the voltage to get in your range. 4 50 watt strips would bang a 2x2 easy seed to harvest !!!
Very successful thus far with samsung f series strips. A little diy can save u hundreds, especially with a limited budget. Four double row strips, or 8 single, in 4ft lengths will have ur 4x4 rockin !!!