I think your going to need more then just 2 lights, a 400w HID light covers a space of ( 6 x 6 ft ). Your 1200 lumes flouros might not do the trick for 10 plants. You could do roughly 4-5, anything higher then that without anymore lights just wont grow. You would spend more money trying to fix it then you would make out of it. ( If you're selling it ).