finally someone with a good question!
the trick is light, light light, with most people not understanding about building reflective surfaces CLOSE.....
its pretty much as your first replier said....lights, side lighting and branch tying
look, if you are trying to do this for results and you can spend the time on various net research and etc, you should, its worth it, and yes, most people say if you get one to two ounces that is good, its NOT, set your standards higher!
Making a plant yield indoors just as much as it would (IN the set amount of space you are using as compared to that SAME space outside) is very doable and it really is about light first. good c02 distribution, nutrients and growing mediums are all seconds but just as important.
The DEA did studies on pot which showed that a plant can READILY yield up to FIVE POUNDS per plant INDOORS.
People with growing basically stick to what their buddies in real life or on the net tell them and don't search around enough for the right answers, keep that in mind