Nope, but I would doubt that it could produce as much sunlight as if there were no roof. Even if the system were 100% efficient, if we assume that the rays fro

Nope, but I would doubt that it could produce as much sunlight as if there were no roof. Even if the system were 100% efficient, if we assume that the rays from the sun are roughly parallel, you'd need as much solar dish area as the square footage of the park to pipe the same amount of light into it. The closest thing I could find to a product is this [1] and at $8000 for a 4-foot dish, you're looking at a lot of money to harvest enough light to grow trees. The whole idea reeks of gaga-green engineers/architects that don't understand how hard it is to grow plants; I don't think they're considering how you need to hit the tree from all angles with the light, otherwise parts of it will die. Also, lots of larger plants depend on the tracking motion of the sun to grow normally. Think about the last time you saw an indoor tree that looked like it was growing nicely: it almost certainly had a glass roof over it, because they really need that all that light to survive. [1] http://pesn.com/2005/07/27/9600139_Fiber_Optics_Bring_Sun_Indoors/p2.htm http://pesn.com/2005/07/27/9600139_Fiber_Optics_Bring_Sun_In...