The Short Answer: Florida's Legal Tint Numbers
In Florida, the legal darkness of car-window tint is measured in VLT — Visible Light Transmission — the percentage of light the tinted glass lets through. A higher number is lighter and lets in more light; a lower number is darker. The rules are set by Florida Statutes 316.2951 through 316.2957. The one number that's the same on every vehicle: front side windows (the two next to the driver and front passenger) must let in at least 28% VLT. That cap does not change whether you drive a sedan, SUV, pickup, or van. What changes is the back glass. On a sedan, the rear side windows and the rear window must each be at least 15% VLT. On an SUV, van, or pickup (a 'multipurpose passenger vehicle'), the rear side and rear windows can go as dark as 6% VLT — nearly blacked out and still legal. The windshield can only carry a non-reflective strip above the AS-1 line — roughly the top five inches. You cannot tint the main viewing area of the windshield at all. Reflectance is capped too: front side windows no more than 25% reflective, rear side windows no more than 35%. Florida also bans color-altering tint that mimics emergency-signal colors (red, amber, blue). So the quick gut-check on a used car you're looking at: the fronts should pass a 28% meter, the windshield should be clear below the top strip, and nothing should look mirrored or colored. If the fronts are noticeably dark, that's the part most likely to draw a ticket — and the part you can negotiate off the deal.
The Windshield Rule: Only Above the AS-1 Line
The windshield is the strictest surface in the entire Florida tint code. You cannot apply darkening film to the part of the windshield you actually look through. Florida Statute 316.2952 allows sunscreening material on the windshield only above the AS-1 line, and that strip must be non-reflective. The AS-1 line is not Florida-specific guesswork — it's a manufacturer's mark etched or printed into the glass under the federal glazing standard (FMVSS 205). Look at the top corners of your windshield and you'll usually find a small 'AS-1' designation; the line runs horizontally from it. When the AS-1 line isn't visible, the common default is to treat the top five inches of the windshield as the zone where a non-reflective tint strip is allowed (often called an 'eyebrow' or 'visor' strip). That strip can knock down sun glare at the very top of the glass, but it cannot extend down into the driver's primary forward view, and it cannot be reflective or mirror-finished. A full-windshield tint — even a light 'ceramic' film marketed for heat rejection — is not legal in Florida below the AS-1 line, no matter how clear it looks. This trips up out-of-state buyers and people who had heat film installed in states with looser windshield rules. For a used-car shopper, the windshield is an easy tell. Stand in front of the car and look at the glass: a legal car has a clear windshield with at most a thin dark band across the top. If the whole windshield carries an obvious film, the prior owner installed something Florida won't pass — and a 'fix-it' ticket plus a re-tint is now baked into that purchase. Heat-rejection ceramic on the windshield is something many shops sell, but the statute makes no clarity exception; the only legal windshield tint is the non-reflective strip up top.
Reflectance Caps and Banned Colors
Darkness isn't the only thing Florida regulates. Two other properties of the film can make an otherwise-legal tint illegal: how mirrored it is, and what color it casts. Reflectance. Tint can't be a mirror. Florida caps front side windows at no more than 25% reflectance (measured on the non-film side per Statute 316.2953) and rear side windows at no more than 35% reflectance (Statute 316.2954). Mirrored, chrome, and metallic 'privacy' films that bounce light back at the viewer routinely exceed these caps even when their VLT darkness would otherwise pass. A film can read a legal 30% VLT and still be illegal because it's too reflective. Color. Florida law prohibits tint that alters the window's color in a way that imitates emergency-vehicle signaling. In practice, that means no red, no amber, and no blue tint. These are the colors associated with police, fire, and emergency lighting, and a film that casts them can be cited even at a legal darkness. Standard neutral, charcoal, and bronze-gray films are fine; a blue or red 'limo' look is not. Why this matters when buying used: aftermarket tint installed cheaply or as a fashion choice is exactly where reflective and colored films show up. A car can pass a darkness meter and still fail on reflectance or color, and the buyer is the one who inherits the problem. Walk the vehicle in daylight and look at the film straight-on and at an angle — a strong mirror sheen or a clear blue/red cast is a flag. None of these properties are visible from a photo listing, which is part of why a tinted used car deserves a real in-person look before you commit. A film that's both legal-dark and neutral-colored should look flat charcoal, not chrome, not colored.
The Medical Exemption: Who Qualifies and How It Works
Florida lets drivers with light-sensitive medical conditions run darker tint than the standard limits, but only through a formal certificate — not a doctor's note kept in the glovebox. The legal basis is Florida Statute 316.29545. It authorizes a medical exemption for people afflicted with lupus, any autoimmune disease, or other medical conditions that require limited exposure to light. With an approved exemption, the driver may carry sunscreening material on the windshield, side windows, and the windows behind the driver — including darker than the standard limits. The process: the applicant completes the Application for Sunscreening Medical Exemption (form HSMV 83390). On that form, the medical-certification section must be completed by a physician or physician assistant licensed under Florida Chapters 458, 459, or 460, or by a licensed optometrist for sight-related conditions. The completed application goes to the Florida Department of Highway Safety and Motor Vehicles, which issues the exemption certificate (TL-55). Key rules that catch people: the certificate is vehicle-specific, it must be kept inside that vehicle at all times, it generally does not expire, and it becomes void when the vehicle is sold. That last point is the one that matters most to a used-car buyer. If the car you're buying has darker-than-legal tint that was 'covered by a medical exemption,' that exemption does not transfer to you. The moment ownership changes, the certificate is void, and the dark tint is simply illegal on your car. You would have to either qualify and apply for your own exemption or remove the tint. Don't accept a seller's exemption paperwork as a reason the tint is fine — confirm whether the film passes the standard limits on its own.