Tint darkness is measured in Visible Light Transmission, written as VLT. The percentage states how much light passes through the glass and film together. It does not state how much gets blocked. A 50 percent VLT film lets half the light through. A lower number means a darker film.
Federal UAE traffic law sets the limit for private cars at 50 percent VLT. This applies to the front side windows, rear side windows, and rear windshield. Anything darker than that is illegal, no matter how it looks or feels inside the car. The front windshield must stay clear. Only a narrow sun strip is allowed across the top edge, usually no more than 10 to 15 cm in height.
Reflective and mirrored finishes are banned outright, no matter what VLT reading they produce. Coloured films such as red, blue, or amber are also banned. Legal colours are limited to black, charcoal, and neutral grey tones.
Police checkpoints use handheld VLT meters. These read light transmission in seconds. A film fitted below the legal limit brings an on-the-spot fine and an order to remove or replace it. The darkness of the film matters as much as its quality.