im going to get a 4x4 tent for just vegging plants about 6 weeks. hopefully i can fit about 9 clones in there for 6-7 weeks with some topping and such. Would a 400 watt light be able to handle that veg? or possibly a nice T5 system like 8 bulbs or something? I have plenty of space in the flower room but im adding this veg tent so I can get more of a perpetual harvest going. I have a cloning cab that the clones stay in the first 2-3 weeks before they get moved to this tent.
You don't need a cool tube. I run an XXXL Reflector with either a 600 or 1000 watt HPS (or MH), and I had that in my tent and it wasn't to hot. But my reflector is glass sealed and I ran the air through it. So I hung my charcoal canister and my light in the tent. I then opened both passive intakes (Secret Jardin 4x4) and put my Max Can Fan on the outside venting into the room for the brief time I had to move out of my actual flower room, about a week. So long enough.
But it worked perfectly and temps didn't get above 90 at the canopy. Which is fine by me. So putting in a 400 would work easily. But I run large fans and 8" ducting so you need good flow.
I usually use a 4' 12 lamp HO T5 for vegging in my 4x4 it covers everything well and they grow GREAT
and I don't have to really zoom the air through to keep it cool.
hth,