I have 2 600w and a 400w HPS being cooled with a 6 inch fan in a 8x4x6 grow with Co2 and a 28 site drip system. We have similar set ups. I am also using a SOG with Sugarberry (widow and blueberry). If you can keep that 1000w cool then by all means do it. My temps are about 85 degrees F during the day.

I am also using the complete line of Botanicare producs with pro bloom. Hydrozyme, and hydroguard are there as well. I use bushmaster and gravity as well. With this last grow I have 14 plants and project to get 2 1/2 pounds. I can fit another 14 in there the next grow and will shoot for 4 pounds. I think the unit can push 4 1/2.

Using the watt per grams I could get 3.57 pounds from those lights but I think 4 1/ will come east.

With a 1000w light in your room you could make 2.22 pounds. Use bushmaster and gravity and you might break past that. Co2 will be needed as well. Your equation for the amount of time can be found online google co2 equation for rooms and I bet you will find it. You need to see how much co2 your regulator will emit. Mine goes to 1 bar. you want 1500 ppm to be in there and the air already contains 300 ppm of co2. so 1200. I think the equation calculator will tell you this. Then just give the dementions of the tent and it will spit out a time. give it a minute past what it calculates for air leaks and the like. set it for every 3 hours but only while the lights are on. stick a small fan on the bottom facing up to blow the co2 back up since it will settle being heavier then o2.

Let me know if this helps