What Is VLT? Visible Light Transmittance Explained
VLT (visible light transmittance) is the percentage of light that passes through tinted glass. Lower VLT means darker film — here is what the numbers
VLT (visible light transmittance) is the percentage of light that passes through tinted glass. Lower VLT means darker film — here is what the numbers mean for your windows.
Visible Light Transmittance (VLT) is the share of visible light that makes it through a window with film applied. A 70% VLT film lets 70% of light through (very light); a 5% VLT film (often called "limo tint") lets only 5% through (nearly black). Every state tint law expresses its limit as a minimum VLT — your film must let in at least that much light.
Two windows on the same car can have different VLT limits: most states restrict the front side windows more strictly than the rear. When you read a state chart, always check each window position separately. The number is about safety — too-dark front glass hurts the driver’s view at night.
See the 50-state VLT chart for the exact minimum on every window.
Frequently Asked Questions
Is lower VLT darker or lighter?
Lower VLT is darker. 5% is almost black; 70% is barely tinted.
Does VLT include the factory glass?
Yes — VLT is measured after film is applied to the existing glass, so the combined result must meet the limit.
Why do front windows have higher VLT limits?
Lawmakers keep front glass clearer so the driver can see at night and officers can see inside.