Here is an example of solar power generation using mirrors to magnify the intensity of light hitting a given amount of solar cells...
http://www.solarfeeds.com/ecofriend/4867-eco-tech-cleveland-researchers-develop-portable-1500-watt-solar-power-plant.html
The interesting thing is the disadvantage of the mirrored surfaces, which have to be cleaned often to maintain their efficiency. So whereas they do not require as much as much investment in expensive solar cells, they have increased maintenance costs...
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