There are different percentages of Visible Light Transmission percentages allowed in car window tint. This is going to depend on the state that you live or even the country, but there are also different VLT levels depending on the position of the window. This means that a windshield is not going to have the same level as the front side windows.
You need to consult with your local window tint provider as they are always aware of the laws in their location in order to provide the best possible results. Just make sure that you follow the laws and regulations in your area and you should do just fine.
