Window tint is sold by a percentage, and that percentage is the most misunderstood number in the business. Here's what it actually measures, what 5%, 15%, 20%, 35% and 50% look like on a car, and which of them you can legally run on each window in Florida.
The percentage is how much light gets through
The number is VLT — visible light transmission: the share of visible light that passes through. A higher number is lighter. A lower number is darker.
- 50% lets half the light through.
- 35% lets about a third through.
- 20% lets a fifth through.
- 5% lets almost nothing through — this is what people mean by "limo tint."
So when someone asks whether 35% or 20% is darker: 20% is darker. The smaller the number, the less light, the darker the glass.
What each percentage looks like
How a shade reads depends on your glass, your interior color and the time of day, so treat these as rough guides:
| Film | From outside in daylight | From inside at night |
|---|---|---|
| 50% | Light shade; the cabin is easy to see into | Barely different from untinted |
| 35% | Noticeable shade; people inside still visible up close | Slightly dimmer |
| 20% | Dark; hard to see into the cabin | Noticeably dimmer, especially backing up |
| 15% | Very dark; mostly silhouettes | Dim; mirrors and the backup camera do more work |
| 5% | Near-opaque "limo" look | Hard to see out on unlit roads |
Florida's limits, window by window
Florida sets minimum light transmission by window and by vehicle type:
| Window | Sedan / coupe | SUV / truck / van |
|---|---|---|
| Windshield | Strip at the top only, above the AS-1 line | Same |
| Front side windows | 28% minimum | 28% minimum |
| Rear side windows | 15% minimum | 6% minimum |
| Back glass | 15% minimum | 6% minimum |
| Reflectance | 25% max front, 35% max rear | Same |
The front limits are in Florida Statutes 316.2953, the rear limits in 316.2954, and the windshield rule in 316.2952. Section 316.2955 allows a measurement tolerance of plus or minus 3 percentage points and requires the installer to put a compliance label on the inside of the driver's door jamb. For tickets, medical exemptions and enforcement, see our full Florida window tint law guide.
The film percentage isn't what the meter reads
Factory glass isn't perfectly clear. Under federal safety standard FMVSS 205, glass needed for driving visibility has to let through at least 70% of the light, and most side glass lets through a bit more than that. Meanwhile the privacy glass behind the driver on many SUVs and trucks comes from the factory already dark.
A tint meter reads the glass and the film together, and the two multiply:
- 35% film on glass that passes 80% → about 28% total
- 20% film on the same glass → about 16% total
- 5% film on the same glass → about 4% total
That's why the number on the box and the number on a deputy's meter aren't the same — and why your glass should be metered before any film is cut.
Percentage by percentage: where each is legal in Florida
50% and 35%. Legal on the rear windows of every vehicle. On front side windows 35% is the usual legal choice, but on darker factory glass it can meter under 28%, so meter first.
20%. Not legal on the front side windows of any vehicle — on typical glass it reads around 16%, well under 28%. Behind the driver it's legal on SUVs, trucks and vans, and on a sedan's rear glass it usually meters at or just above the 15% limit on clear factory glass.
15%. Never legal on front windows. On a sedan's rear windows it's right at the line once the glass is counted — 15% film on 80% glass reads about 12%, at the very edge of the 3-point tolerance. Behind the driver on an SUV, truck or van, it's comfortably legal.
5%. Never legal on front windows or on a sedan's rear windows. Behind the driver on an SUV, truck or van, Florida's floor is 6%; 5% film on clear factory glass reads around 3–4%, which sits at the edge of the tolerance. Over dark factory privacy glass it reads far lower than that and isn't legal.
Darker isn't cooler
Most of the heat you feel through glass is infrared, and a tint percentage only measures visible light. Heat rejection comes from what the film is made of, not how dark it is — a quality ceramic film at a legal shade rejects far more infrared heat than a cheap dyed film at an illegal one. Our ceramic IR film rejects up to 96% of infrared heat. If what you really want is a cooler car, ceramic window tint gets you there without the ticket; the ceramic vs. carbon vs. dyed guide explains why.
The only legal way past the limits
Florida's medical exemption, under section 316.29545, covers people with lupus, autoimmune diseases and other medical conditions that require limited exposure to light. The Florida Department of Highway Safety and Motor Vehicles issues the exemption certificate for a specific vehicle; it isn't transferable, and it can cover the windshield, side windows and rear windows. The step-by-step process is in the law guide.
What most Navarre drivers pick
The most common legal setup we install on a sedan is 30% ceramic on the front sides and 15% on the rear. On an SUV or truck it's 30% up front and 5–6% behind the driver. Both look dark, both cut real heat, and we meter the glass before we cut anything.
Carbon starts at $299.99 on sedans, nano ceramic at $349 and ceramic IR at $449, installed at your home or work, seven days a week, or at a Navarre shop appointment. If you just arrived at Hurlburt or Eglin with darker tint from another state, start with our PCS-season guide.
Not sure what percentage is on your car? Text (850) 930-1195 — we'll meter it free. Get a free quote · Call / text (850) 930-1195