Basically our product UGC® works by forming a thin film that absorbs light in the Ultraviolet.

The simplest explanation is that keeping in mind ultraviolet light has a lower wavelength (higher photon energy) than other light. As such UGC® has a band gap larger than that of visible light (>~3eV, TiO2 which is what is used in sunscreen for example), in this manner UGC® screen’s out the UV Photons; so effectively you could say it is fully absorbed sunscreen for your windows.

Notably the film does not have a necessity to be very thick at all because the absorption of light scales exponentially with the absorption coefficient (Beer’s law).