Solar power is one of the best and still underutilized efficient energy sources.  This home inventor makes a super powerful aqua lens in his backyard and here is how he describes it:

This solar water lens that is almost 30 inches in diameter is grid free energy and can burn through wood quickly. It delivers a very large powerful focal point that is only useful around noon in the summertime when the sun is directly overhead. The material is crystal clear vinyl shower curtain. This lens concentrates about 500 watts of solar heat energy to a focal point of 1 inch optimal with a 3-6 inch scatter.

Awesome..let’s watch this thing magnify the sun in the video on page 2!

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