Its possible but like its been said, not with the lighting you have.
My last grow that i put up on RIU, i had 5 plants and yielded a 1/2 lb.
Basically if your gonna shell out the dough for those bomb ass strains man, shell out the lil extra dough for a 1000w light. After you get the light, your gonna want to wait until theyre about 8" tall , n then start topping every two weeks, until you have a bush. Once achieved, your gona want to veg your plants for at LEAST 3 months if your looking for 1/2 lb per plant, but even then i dont know if you'd be able to pulll it.
I mean, anything is possible. Do you see what people yield when they grow OUTDOORS? any one of our little plants that we get 2oz from per plant, if taken outdoors and put through the normal grow cycle of nature, can turn into a fuckin 8ft tall bush, with 1lb worth of buds all over it.
Outdoors is obviously the superior way to grow, but if your looking to get similar results indoors, your going to want to use 5-8gal buckets, preferably DwC or some type of recirculating system, and then grow your plants the same way you would outdoors. Make sure you have plenty of headroom, and just let them go veg for as long as humanly possible, or rather as long as you can possibly wait, lol, n then kick them over in to flower. You'd probably need more than One 1000w light system if your looking for 1/2 lb from each of your 4 plants. I'd say aim a bit lower, and shoot for 6-8 oz altogether.
Get yourself a 600w light system for $250, n veg your plants until they are about 14" tall, including the time taken to top your plants twice so you have 4-6 main stalks. Once topped, and recovered, and grown out to 14", then kick your plants into flower. You'll end up with some 4' tall bushes that'll give you anywhere between 2-3 oz of some dank bud.
But there are no garuntees when it comes to growing. Its all about the grower, and what the grower knows about his/her plants. You have to learn a plant's nuances before you can estimate what your yield is gonna be. Its possible to do everything in your power to ensure your gonna get the most bud possible out of your plants for your experience level though, so take some time to read over some grow journals, check out what other people are doing, and find out what seems like the best fit for you. Hell, If i were you, i'd spring for the bigger light, and then just transplant each plant into its own individual BALE of promix, still packaged, and then poke draineage holes in the bottom, and hang my light over them big bitches, lettin them settle in for a nice 3 month veg, n then kick them into high gear. Now theres a thought, lol.
-K1.