dont quote me on this, cause im new here/to this aswell, but 2x 125WCFL's in a big closet is probs abit weak for 4! plants.....what have you got round the sides for reflection? can you not put smoe white boards up each side?

from your pic it seems theres not enough light for the plants, so either more bulbs or enclose the space abit more for tight,close reflection