Hello everyone long time member but I haven't been growing for several years. I finally have time, $ and a place to grow again so I'm going to get back at it. The room is going to be 4ft/10ft with 7 ft ceiling. My plan is to run 2 1000w HPS each one positioned over a 4x4 soil bed. I have access to a fresh air via a window and am debating exhausting the air out the roof of the room and then out the side of the building. That will keep that exhaust about 15ft off the ground lessening the chances of it being as noticeable. I plan to have a fan blowing between the light and the tops of the plants to keep heat buildup from happening. Also another fan blowing the air around the base of the plants to keep good air circulation up through bushy plants. The plants will all be clones put into the soil bed in rows. They will be given a couple few weeks to veg then quickly put into flower. Plan is for a Sea Of Green grow. Now for the questions. First what size exhaust fan would you recommend? Last indoor grow I did was a 1m/1m/2meter grow tent and I used a 4 in. squirrel can fan (can't remember how much air it pumped) and I spent my time wishing I had just gone with the bigger 6 or 8 in. version that pumped more air. So I was considering a big one. I have used an air cooled sealed hood in the past but I have heard negative things about the loss of intensity caused by the glass so will probably not do that this time unless it becomes absolutely necessary for heat issues. If needed I could buy 2 one to exhaust the air from the room and one strictly to pull fresh cool air from outside in through sealed air cooled reflector hoods then exhausted back outside. I would prefer not to have to do that though. Question 2 is about the soil beds. What depth of soil would you recommend for this style of grow? I was thinking maybe about 14 in. of soil depth? If I could get away with less that would be better but def not going to go any deeper than 18 in. no matter what. What kind of spacing for the plants in the bed? My thought was 1 per square ft. so 4 rows of 4 in each bed. Should I do more or less or is this a good range to start in and adjust it as needed for the strains I'm growing? Question 3 is about my electric choices. I plan to have each 1000w light to it's own dedicated 20amp breaker. The exhaust fans will be on another 20 amp. The couple/few internal fans will be run off a couple outlets already wired into the space on a shared 15 amp. All the outlets will be GFI ones. Next spring if I need to put in an ac I will probably run another breaker for. I'm sure I will have some more questions but just overall anyone see any glaring issues that are going to smack me in the face. Any better ideas than what i'm planning? I guess lastly am I wasting my $ on HPS are the LED comparable these days in actual grams per meter squared? Or am I still best just getting the HPS. Maybe use an led in the middle of the 2 soil beds so they get better full spectrum light but still get the dense buds and good yield of HPS? Thanks for the advice in advance.