Have you ever wondered, “How does car tint percentage work?” At Sunbusters Window Tinting Limited, we help drivers understand the science, style, and legal side of window tinting so they can choose a solution that fits their vehicle, lifestyle, and local regulations.

Read on as the leaders in professional car window tinting in Austin discuss what tint percentages really mean.

What Does Tint Percentage Actually Mean?

The tint percentage scale refers to how much visible light transmission (VLT) gets through your vehicle’s windows. Simply put, VLT is the amount of visible light that passes through both the glass and the window tint film combined.

• A 5% tint means only 5% of light passes through, making it extremely dark (often called limo tint).
• A 35% tint allows 35% of the light. It’s darker but still legal in many areas.
• A 70% tint is quite light, offering a subtle look while still cutting glare.

When picking your ideal window tint, consider your priorities. Are you most interested in privacy, aesthetics, glare reduction, or heat control?

How Does Factory Tint Affect Your Final Look?

How does car tint percentage work when adding film to factory tinting? Many vehicles roll off the lot with tint, especially in rear windows. This tint is typically embedded in the glass. Factory tint levels usually measure between 15% and 30% VLT.

When you apply additional aftermarket tint over factory glass, the combined VLT becomes darker. For example, adding a 20% film to a window that already has 20% factory tint could bring your total VLT down to a level that’s too dark for local laws.

What Are the Legal Tint Limits in Texas?

You must understand local legal tint limits before choosing your film. Texas law requires that:

• Front Side Windows, when measured in combination with the original glass, must have light transmittance value of 25% or more. 
• Windshields may only include tint above the top AS-1 line. A clear (un-tinted) UV Film is allowed anywhere on the front windshield without a medical exemption being required.
• Rear side and back windows can be darker, depending on vehicle type. 

Because enforcement involves using VLT meters to check compliance, it’s crucial to get it right the first time. That’s especially true when combining aftermarket tint with factory glass.

Does Tint Darkness Equal Better UV Protection?

Perhaps surprisingly, the answer is no. A high UV protection level doesn’t always mean a darker film. 

Premium films, like ceramic or crystalline options, can block up to 99% of harmful UV rays even at lighter tint levels (like 70%). These advanced films also help reduce heat and glare, making them a great choice for comfort and protection without breaking the law. And they won’t dim your cabin too much. 

Schedule Your Tint Consultation With Austin’s Top Experts

Still wondering, “How does car tint percentage work in real-world terms?” A certified installer like Sunbusters Window Tinting Limited can explain it all and use professional tools to calculate your final VLT.

While you’re here, check out our other posts on related topics, like the health benefits of tinting, when done correctly. Let the experts at Sunbusters Window Tinting Limited help you navigate the tint percentage scale and find the perfect fit for your vehicle. 

Call us today at (512) 794-8468 to schedule your appointment!