How is the light transmittance measured? What level is 96.5%?

A: Transmittance refers to the percentage of transmitted light flux to incident light flux after light passes through a transparent material. It is usually measured by a spectrophotometer in the visible light band (380-780nm) and the average value is taken. Reference standards for light transmittance of mobile phone films: ① Ordinary tempered films: approximately 88-92%; ② High-quality high-definition film: approximately 92-95%; ③ High-end AR optical film: ≥95%; ④ Over 96% is considered excellent. Woowhead Guanfudun has been tested by SGS (Report number SZIN2606001469PL01_CN). The measured typical value of light transmittance is 96.5%, and the mass production standard is ≥96%. It is at an excellent level among consumer-grade mobile phone films. High light transmittance means that after applying the film, the screen brightness loss is small, color reproduction is accurate, and the picture transparency is close to that of a bare screen. At the same time, the haze is only 0.4%. The combination of high light transmittance and low haze ensures the picture quality. One piece per pack costs 129 yuan.