idf the plant is that big and getting ok light its gonna keep on doing what its doing if you leave it there how long has it been budding for?

once the tops are full and feel dence and the leaves start to discolor around the buds it should be done nut theres alot of things to do to make it work right then just watching it bud you should look in to it just goto google or limewire download free growing guides or movies

lights if you gotta little bit of money then get and hps and if you have barely any money then go with fluros but ive seen desent buds with fluro's