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Terminology​
These are the terms you need to know in order to interpret the various state laws and limits.
VLT%: Visible light transmission is the measurement used to assess automotive window tints. This is the percent of visible light that gets through either the film (film VLT%) or window plus film net VLT%. The lower the VLT%, the darker the tint.
Front-side window tint level: This is the amount of tint (VLT%) you’re allowed on your driver and front passenger windows. This is frequently a higher value than for the rear, which allows the driver of the vehicle to be seen from outside.
Rear-side window tint level: This is the amount of tint (VLT%) you’re allowed on your rear side windows. This value is sometimes different for passenger cars and multi-purpose vehicles (MPVs).
Rear window tint level: This is the amount of tint (VLT%) you’re allowed on your rear window. This value is typically the same as for the rear side windows, but some states are more restrictive.
Windshield: Your windshield cannot be tinted in any state, but some states allow you to add a sticker to the top of the windshield, usually in the area of the manufacturer’s sun shield.
Color: The state laws on tint color vary from no restrictions at all to restrictions on the use of certain colors or reflective/mirrored finishes.
AS-1 Line: This is the line extending from the letters AS-1, found on most motor vehicle windshields, running parallel to the top of the windshield.
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