from what i read the diesel gets to about 18 inches tall without too much side branching and can yield as high as 2.5oz each with ideal conditions. i am going to grow them in 5L pots as recommended and try and put 30 diesels in the closet. i would love to hit 2.5oz per plant but would still be happy with anything over 1.75oz each. i have seen people getting 1.25oz using a 400w HPS so i dont think it should be to hard to achieve those numbers or better since im using 1000w. i know that 30 plants in 20 square feet may seem tight but thats why i chose diesel ryder for its main cola growth pattern and also since it doesnt have much branching. worst case i would do some mild pruning of the lower leaves when the plant has become more established and can afford to have them cut down.