EN 
Introduction
It is well known to the public nowadays that excess Ultraviolet (UV) radiation from Sun exposure can be harmful to human skin. Sunscreens have been widely used by consumers to protect the skin against sunburn and more importantly chronic sun-induced skin damage. However, UV light constitutes about only 7 % of the total solar radiation that reaches the surface of the Earth. Infrared (IR) light, on the other hand, constitutes approximately 50 % of solar radiation.
