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Published on Apr 28, 2012
This is a 64" spot Fresnel Lens with a max temperature above 3000˚F. http://www.greenpowerscience.com/ The concrete and rock shatters from the temperature shock. Slowly adding heat allows for melting. The rock was exposed for 60 seconds and the two pieces heated 8 ounces of water from 68˚F to about 130˚F within seconds.