When choosing window tint, VLT describes the share of visible light transmitted: under comparable conditions, a lower figure means a darker result. First check whether the value describes the material alone or film on reference glass. The number in a model name can also differ from measured VLT.
For example, LLumar's North America data sheet reports results with 6 mm clear glass. ATC 50 has a listed VLT of 60%: the model's “50” is not that measured value. Do not multiply that table value by your glass transmission again: reference glass is already included.
The illustrative calculation 0.80–0.85 × 0.60 ≈ 48–51% is an approximation only if 60% describes the separate material and 80–85% the original glass. It is not a universal formula for every catalogue VLT or a measurement of a car. A VLT of 60% means 60% transmission under the stated test conditions; 60% darkening is a different measure. Ask which figure the seller is using.
Heat performance also depends on the specifications of the particular film. Compare the product's measured properties rather than assuming all films with the same VLT perform alike.
Interior Ministry Order No. 165 as amended by No. 47 on 2 July 2024 sets different light-transmission reduction limits without patrol-police consent: up to 60% for front side windows and up to 75% for side windows next to passengers behind the driver. This does not mean a film with that number on its label suits every vehicle; the completed glass needs measurement.
The front windshield has a separate rule. Amendment No. 14 of 26 March 2024 prohibits reducing its light transmission except for manufacturer-applied darkening of no more than 30%. Do not apply the side-window limits to the windshield or assume a clear athermal film is automatically allowed there.
The order treats the rear windshield and certain other rear glass separately. Thus “5% film is legal on every rear window” is not sound advice: identify each window type and measure the finished light transmission.
Decide where privacy matters and where night visibility matters more. View a sample on glass similar to your car's. Check the model, measured VLT and test conditions, then measure the original glass and discuss the expected result with the studio. Check finished windows with a meter after installation. Different window categories are covered in the separate rules article.
It may mean VLT of 60% under the technical sheet's test conditions or 60% darkening. Clarify the measure, reference glass and model; do not equate them with your car's finished-window reading.
Side windows next to passengers behind the driver have a light-transmission reduction limit. The film label alone cannot establish compliance; measure the particular window and check the applicable rule.
No. The final side-window reading matters, and the windshield has a separate rule for manufacturer-applied darkening.
VLT helps compare shades, but compliance and comfort depend on window position, the original glass and the post-installation reading. There is no single “legal label number” for every window.
Book a window-tint consultation with BESTAUTO through the service page or by calling either studio:
Both studios are open Monday to Saturday, 10:00–20:00. Before choosing a film, ask for a reading of the original glass and discuss the expected finished result.
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Tell us your car model and the windows involved. Discuss the selected film's measurements and a glass reading with your preferred studio.
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