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Practical instruments heliotube
Practical Instruments is developing a "heliotube" designed to fit into traditional solar panels. The tubes follow the sun during the course of the day and concentrate the sun's light to draw more electricity from the solar cells.
Energy Innovations, an Idealab company, has developed the Sunflower, a heliovolt which has 25 mirrors to concentrate sunlight on a single solar cell. The technique is designed to get more electricity from expensive silicon cells, making the overall system more cost-effective.