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Calculate net VLT% after tinting and check state legal limits for window tint.
Window tint VLT (Visible Light Transmission) measures the percentage of visible light passing through a tinted window. Net VLT combines factory glass tint with aftermarket film to determine the actual light transmission.
| VLT | Name | UV Block | Use |
|---|---|---|---|
| 70% | Light | ~50% | Factory tint level |
| 50% | Medium | ~70% | Slight darkening |
| 35% | Standard | ~95% | Most popular choice |
| 20% | Dark | ~99% | Privacy tint |
| 5% | Limo | ~99% | Maximum privacy |
| State | Front | Rear | Windshield |
|---|---|---|---|
| California | 70% | Any | 4" strip |
| Texas | 25% | 25% | 5" strip or AS-1 line |
| Florida | 28% | 15% | Non-reflective above AS-1 |
| New York | 70% | 70% | 6" strip |
| Arizona | 33% | Any | Non-reflective above AS-1 |
| Michigan | 70%+ | Any | 4" strip |
Formula
Net VLT = Factory Glass VLT × Film VLTFactory Glass VLT = VLT percentage of the vehicle's original glass (typically 70–80%)
Film VLT = VLT percentage of the aftermarket tint film applied
Worked Example
75% factory glass + 35% film
Did you know? The Skin Cancer Foundation recommends window tint that blocks at least 99% of UV rays. Even clear UV-blocking films can protect against skin damage, as the International Window Film Association reports that untinted car windows block only about 60% of UV-A rays.
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