New grow room for growing trees

I am designing a room to grow 10 large plants.

Will be growing in 10-15g pots, this is the lighting I was thinking of using, if anyone has any knowledge they would like to share or point me in a different direction, feel free.

4 x 1000w hps with reflectors
3 x 400w hps to hang down in between the plants for the lower canopy.

I have limited height to work with (8ft), so I think I will need to top the plants to try and form large 6ft bushes if possible. Thinking about growing BC Bigbud, not sure how that reacts to topping though.

The room dimensions are 12 x 12. Im gunning for a 5lb yield, but think I will be able to bring the yield up closer to 7lb once I fine tune it. Any suggestions? Think this will be adequate lighting?

If your room is only 8' high then you have some serious height issues with the plants you are trying to grow. Figure the glass on your hoods will be at minimum 1' below your ceiling. Then you really can't have your plants much closer than 18" for fear of bleaching. I think 5' bushes are more reasonable. And that is 5' from the floor; not from the top of your pots.

You might want to look into LST to train your plants during veg and make them really bushy. You might even want to do a SCROG with them. I don't think you are going to need 4 1000w bulbs though. Even if they are SUPER bushy and take up 3sq.ft. per plant then you would have 2 rows of 5 plants that was a total of 6' wide by 15' long. If you are on a budget you could get away with 3 1000w lights for this setup pretty easily; especially with the hanging bulbs.

I think you will find a lot of info on mixed spectrum supplemental lighting. In my opinion it would help a lot more if you used 400w MH bulbs to hang in the canopy. The mixed spectrum actually will increase your yield more than just HPS. Just make sure you constantly rotate your plants around the room

If you can add Co2 it will help increase your yield. I think 5lbs. is reasonable if you LST and have experience growing before with an understanding of nutrients and the plants.

Good Luck!!

Check out my thread Grow Room Floorplans. I'll mock up a floorplan for you.