What is the minimum total solar reflectance percentage for visible light on the non-film side of tinted windows?

The minimum total solar reflectance percentage for visible light on the non-film side of tinted windows is established to ensure that a certain level of light can pass through while still providing some degree of glare reduction for the driver and passengers. A total solar reflectance percentage of 25% means that at least a quarter of the visible light is reflected, which contributes to improved visibility and comfort in the vehicle. This standard balances the benefits of tinting—such as reduced heat and glare—while still maintaining safety on the road by ensuring that drivers have an adequate view of their surroundings. A lower percentage would undermine these safety protocols, while a higher percentage is permissible, but 25% is the established minimum requirement for compliance with Indiana traffic laws.