You want around 4000-5000 lumens a sq. foot you have 9 sq. feet. A 400w hps puts out around 50000 lumens so a 400w hps will put you at a lil over 5k lumens a sq. foot. Height does not matter to much to the light factor. It does matter in ventilation so a 3x3x6 box will = 54 cubic feet. just example so you would want at least a 165cfm fan maybe a lil bigger for your exhaust. And usually your plant ill double in size by the end of flowering sometimes even triple. Hope that helps you alil bit:jointsmile:


~One~:rastasmoke:
~BudG~:rastasmoke::rastasmoke: