fresnel lens Archives – The Green Optimistic green tech news, since 2008 Sun, 08 Feb 2015 14:03:48 +0000 en-US hourly 1 https://wordpress.org/?v=7.0 2667534 Solar Concentrator DIY – How to Build an $8 Fresnel Lens from Old TV https://www.greenoptimistic.com/solar-concentrator-diy/ https://www.greenoptimistic.com/solar-concentrator-diy/#comments Wed, 13 Mar 2013 11:59:45 +0000 https://www.greenoptimistic.com/?p=34791 A solar concentrator DIY can seem like the easiest thing in the world – if someone else is doing the hard work. A guy who calls himself “Grant Thompson” used a Fresnel lens from a dismantled old Toshiba projection TV and shows the world on Youtube how his DIY solar concentrator can scorch nearly anything from pennies and […]

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