For a thorough discussion both of the limitations of imaging COan)<Ku  
optical systems in the collection of radiant energy and of the \p@nH%@v  
nonimaging collectors which can be used to collect energy 1f@U:<:  
efficiently, see W.T. Welford and R. Winston, High Collection 0(U3~k6  
Nonimaging Optics, Academic Press (San Diego), 1989.

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