Another misconception is that window tint is bonded onto the outer surface of auto glass. Window tint is applied on the inner surface which also protects the film itself from flying debris outside the car.

Once tinting film is applied to a window, the characteristics of how visible light comes into the car changes. Normal auto glass without tint reflects around 5% of visible light known as VLR%, absorbs another 5%  known as VLA% , and transmits 90% of visible light known as VLT%  into the car.
Depending on the type and quality of tinting film applied to a window, these percentages change dramatically. Some tint are more reflective, and others absorb more light. The number you will most commonly see is the VLT% Visible Light Transmittance. Almost all the official names of films include the VLT% within it like Johnson Executive P35 or Medeco Charcol 55 VLT% tells you how much visible light is allowed to shine into the car, and also indirectly how dark the tint looks.

Tinting film doesn't just block visible light. It also blocks harmful cancer-causing ultra-violet UV A and UV B rays as well as infra red IR rays that cause heat to build up in your car; however, how effective a film is in blocking these rays depends on the type of film, the manufacturer, and the quality of installation.

We at Startronics understand that tinting is a complicated subject, and we aim to help you find the right tint for your car based on your needs