However, it is important to understand that the darker the tint does not necessarily increase the level of UV protection. In Australia each state has regulations that stipulate the maximum darkness of the tint, referred to as the visible light transmission level or VLT.
Window films, both clear and tinted, can reduce UV radiation by over 99%, making it an effective preventative measure against UV radiation. In some cases, it has been estimated that up to 79% of UV A radiation can penetrate tempered glass. The amount of UV A that can penetrate tempered glass can vary dependant on a number of factors including the thickness and colour of the glass. However, UVA radiation can still penetrate tempered glass, whereas about 98% of UV A is blocked by laminated glass due to its design. Laminated glass, used for windscreens, and tempered glass, usually used for side and rear windows, both block UV B radiation.
The type of glass used in vehicles also determines the amount of UV reaching the inside of the vehicle. With vehicles there are a number of factors that influence the UV levels inside a vehicle such as whether windows are open or not, and the position of the vehicle in relation to the sun. Glass in commercial buildings and vehicles can block a percentage of UV radiation, however the amount depends on the type of glass.
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