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Spherical glass lens concentrates sunlight by up to 10,000 times, boosts solar cell efficiency | Engadget
Amazon.com : 8.3" x 11.75" LARGE 3X Fresnel Lens FULL PAGE Magnifier -- Solar Oven/DIY Projection TV PLANS (1 pack PREMIUM GRADE Large Lens) : Health & Household
Inflatable Fresnel Lenses as Concentrators for Solar Power - Tech Briefs
Hampton Bay Parkwood 2-Tone, Bronze and Gold Solar LED Weather Resistant Path Light 14 Lumens with Water Glass Lens and Vintage Bulb 52300-024 - The Home Depot
Micropyramid lenses triple the light that hits solar panels | TechCrunch
Solar Ball Lens Improves Energy Efficiency 35% - CleanTechnica