Need the help of growing experts?

I have a space 15ft long about 4 ft high and about 4 ft wide how can i optimise the space i have to grow the best?

Well I wont proclaim to be an expert however until one shows up I will add my 2 cents.

Section off flowering and grow area. I would grow with Floros and flower with HPS.

Because of the height I would say use two 400w bulbs to flower with in about 8 feet of the space. Veg in about 4 feet and keep mothers in the last 3 feet.