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Hi Aaaecm;Technically, there is NO method of secondary imaging mirror or lens that can increase concentration more than the first mirror or lens. (Non-imaging mirrors or lenses can increase concentration but these are relatively difficult to make. See Roland Winston's CPC or Concentrating Parabolic Concentrators.)These parabolic dishes already do a good job of high concentration by themselves.You may think things like telescopes, with a secondary mirror concentrate light. But that is NOT TRUE. Telescopes, by definition, spread out the light. All light concentration is done only in the primary mirror or lens.redrok
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