in general you want atleast 50 watts per square foot and in a 2 by 4 area you have 8 square feet and you are just over the 50 watts per sq ft with the 430 alone but if you can add a temporary wall so you are not wasting light in the unused area of the room it will help. might want to read og faq about light placment in a rectangular grow area to get the most out of your 430.
the 150 may still be worth using in flowering by providing some side lighting to some of the lower bud sites on a couple of plants but it could also not be used at all and probably isnt worth using as a light over the plants.