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I would like to clarify a few things. The proper use of % refers to the amount of light that passes through the film. When you say 20%, that is a medium/dark film that lets only 20% light through it. As for any window film from the lightest to darkest, most will filter out about 98+% of the UV rays. There are UV inhibitors in the adhesive of the window film. As for heat reduction, there is no way an almost clear film will reduce alot of heat unless it was reflective. A 70% light transmittance film will reduce about 33% of the heat. That is probably the darkest that you should tint the windshield but I always advise my customers against it as you might see a slight bit of distortion due to the angle of the glass because you will be looking through the film at a angle. The adhesive on the film may cause that slight bit of distortion when you see headlights or tail lights, especially at night. I have been tinting for about 15 years now and in California, it is definitely against the law to tint the entire windshield. It really depends upon the officers as most will not pull you over if the window film is not that dark. There is a clear film which transmits about 85% light that is legal for use in California on the front doors. I am assuming you are referring to that film which is made by CPFilms. It filters out 99+% UV but only reduces about 12% heat. If you have any questions, you can always e-mail me. Good luck.Sidney
I would like to clarify a few things. The proper use of % refers to the amount of light that passes through the film. When you say 20%, that is a medium/dark film that lets only 20% light through it. As for any window film from the lightest to darkest, most will filter out about 98+% of the UV rays. There are UV inhibitors in the adhesive of the window film. As for heat reduction, there is no way an almost clear film will reduce alot of heat unless it was reflective. A 70% light transmittance film will reduce about 33% of the heat. That is probably the darkest that you should tint the windshield but I always advise my customers against it as you might see a slight bit of distortion due to the angle of the glass because you will be looking through the film at a angle. The adhesive on the film may cause that slight bit of distortion when you see headlights or tail lights, especially at night. I have been tinting for about 15 years now and in California, it is definitely against the law to tint the entire windshield. It really depends upon the officers as most will not pull you over if the window film is not that dark. There is a clear film which transmits about 85% light that is legal for use in California on the front doors. I am assuming you are referring to that film which is made by CPFilms. It filters out 99+% UV but only reduces about 12% heat. If you have any questions, you can always e-mail me. Good luck.
Sidney
