There are two possibilities available, one of them affects the windows you choose to buy. Firstly, purchasing windows with a Low-E (low-emissivity) coating applied to the panes will help you reduce UV light by 50%. You can cut the penetration of UV rays by 99 percent if you choose to take a different path and choose windows that are laminated, insulated glass that has PVB (polyvinyl butyral) for the inner layer and a coating of Low-E.