Today's solar cells are pretty inefficient. They're only able to convert around 20% of the sunlight into electricity. Part of the problem is that panel efficiency drops drastically at short wavelengths, from blue-cyan to Ultraviolet. We take this short-wavelength light that the solar cell can’t handle very well and downshift to long-wavelength light, that’s to say red light. Our secret: Quantum Dots, nanoparticles in a coating on the glass.