Iv seen all sorts of setups that try to make more efficient use of a particular light source, but ultimately the only thing thats improved is the efficent use of space. One example is verticle grow setups. They yeild about the same or less as typical setups, but they make much more efficient use of the available space.
I have also seen really well done rotation grow systems that rotate plants around a verticle light source.
The problem is that the light source is the limiting factor, no matter if you increase the surface area exposed, the amount of energy leaving the source will be the same that reaches the plant. You really only distribute the energy in a more even fashion, however i can see some negative qualitys to this also.
If you want to try increase your yeild with the same power demands, you will want to look into plant training. Utilizing the available light as efficiently as possible by controlling your canopy and plant structure. The most efficient system there is, is likely sea of green. The more plants you have, the shorter your veg time.

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