"any advice on Vegging under a 600w hps ina 4x4x6 grow box
& then flowering in the same box ?"
No problem there. Just reset the timer from 18/6 or 20/4 to 12/12.
pot sizes ? how many times to transplant?
want 4-5 plants
trying for around 3 months seed-harvest
You realize that 4 x 4 is a pretty small space? OK, here's my best bet to meet your goals.
Given your space you have to consider head room as well as only having a 4 x 4 space. At
6 feet you will eat up 12 inches with the pot on the floor as well as 6-12 inches to hang the light.
So you need to finish your plants at around 3 feet tall max. You can do all that if you start 4 auto-
flowering plants. They are mostly short, and more important here, usually grow straight up without
a lot of side branching. Those extra branches are usually desirable but in your case you don't have the room to
grow 4 regular bushy plants. So check Attiude under "Autoflowerers, feminized" and search for autos that are short and grow
one main cola. If you aren't sure about what to look for slip me a PM and I will send you some links.
Good luck, BigSteve.