I just got into trying to grow. i have a -600 watt hps/mh lighting -4 x 4 x 6.5 grow tent(in feet) my cooling, soil and other things are still being planned but i have a good idea of what i need. i just want to know with lighting and tent size, Is lighting going to be an issue?
No you won't be having an issue 4x4 is a good size for a 600w, gives you almost 50w per SQF. Although heat might be an issue, i'd get a 400cfm 6" inline fan and a 6" scrubber, if your hood is air cooled you could have yourself a nice little setup.