This (model B or mod b) open frame LED lamp uses a large block of glass as the diffuser. The frame itself is 2x4 wood. An aluminum wrap inside with two LEDs make this a very bright emitter. The block of blass is an expensive part, about $25 at Rona.
http://georgesworkshop.blogspot.ca/2012/02/very-bright-1-watt-diy-led-garden-light.html
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