Within the first month of flowering the plants will continue to grow height-wise and can very easily double in size. Due to this and your limited space keep the vegetative period shorter; force flowering when the plants are slightly greater than a foot tall and don't try to push it. If you have 5 feet of vertical space, then you really only have a couple of feet for plants (maybe 3 ft MAX). The light needs room to hang and you can't have the plants growing into it. Because it is just a 150 watt you might get away with keeping it several inches away as opposed to the 1-2 ft distance that is called for when using 400+ watts.
Also, the containers the plants will be in for the duration of flowering could easily take up a foot. Ideally you should use 2 or 3 gallon containers; 2 gallon is fine if your plants are going to finish at roughly 2 ft.
You might consider topping in order to keep the plants shorter and increase the number of primary colas. Even if you only grow out one topped plant you should manage to yield a couple ounces dry. With all other conditions ideal it is the amount of [the proper spectrum of] light that determines yield.
Since you also posted this in the organics forum, I feel compelled to inform you that Tiger Bloom is not an organic or all natural fertilizer (most liquid Fox Farm fertilizers aren't). Even though it might be 'based' upon ingredients such as earthworm castings it also contains synthetic salts and the chelating agent EDTA. EDTA should be avoided at all costs in organics due to the adverse effect it has on soil microbes.
Ocean Forest is an all natural product and a suitable soil for organic gardening. It is rich in organic amendments and should feed plants for at least a couple weeks or up to a month. If you want to grow organically you'll just have to find an alternative organic liquid fertilizer, or use amendments like high phosphorous bat/seabird guanos or consider tea brewing.
