A bottle of super economic solar light

The idea presented in this video is excellent in the very densely populated city areas where there is no room or/nor economic resources for standard windows. The idea presented here is also called: A liter of light.

About Vesa Valtonen

Composer Vesa Valtonen IPI 644437147. Visit my page music compositions at http://www.vesavaltonen.com in English (or http://www.vesavaltonen.co in Spanish).
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