size tent

Hey guys. I am going to buy a 350 real wattage LED. I have 3 cfls 2700k for flower, 2x20w & 1x32w = 422 watts I know i should go for about 30-50 watts pr sqft I am from Denmark, so i use m2 instead. Would it be a waste to go over 50watts pr sqft? If i buy a 80cm*80cm*160cm, it would sound like...