Some spectrally selective window films block certain wavelength of infrared rays and reflects back the heat without reducing the naural light. Protection from UV rays is accomplished by by a thin colourless SunGlo window film which accounts usually for addressing the UV spectrum. This step used in window tinting would reduce the UV rays upto 380 nanometer. These things depend upon the manufacturer who adds UV inhibitors to polyester during glazing.The ore efficient type of window films are available at SunGlo window films which rescues the UV radiation upto 400 nanometer. Upto 500 nanometer tinted SunGlo window films are available.