Picking a tint shade sounds simple until you’re staring at a chart of percentages and none of them mean anything. Is 35% dark? Is 5% even legal? Will the shade you want get you pulled over on the 405?
Here’s the plain version. Window tint is rated by VLT, short for Visible Light Transmission. It’s the share of light the film lets through. A 5% tint lets 5% of light in, so it’s nearly blacked out. A 70% tint lets most light through and looks almost clear. Lower number, darker glass.
Below is what each common level actually looks like, who tends to pick it, and where California’s tint law draws the line.
What VLT Percentage Actually Means
VLT measures how much visible light passes through your film and glass together. The number printed on a film roll is the film’s rating on its own. But factory glass already blocks some light, so the finished window usually reads a little darker than the film’s number by itself.
That matters here, because California checks two numbers on the front side windows. The film has to be rated 88% or higher on its own, and the window has to measure at least 70% once the film is on. A shop that knows the local rules will account for your glass so you don’t fail a roadside check.
5% Tint (Limo)
This is the darkest tint most people ever see. From outside, the glass looks black and you can’t make out anyone inside. They call it “limo” for a reason.
Drivers pick 5% for privacy and the blacked-out look, and it cuts glare and heat well. The trade-off: you can’t see much out of it at night. And in California it’s only legal on the rear windows of certain vehicles, never up front. More on that below.
20% Tint
At 20%, the glass reads clearly dark from outside, but you can still catch a faint outline of people or objects inside when the light’s good. It’s a popular middle-dark pick for people who want strong privacy without going full limo.
Twenty percent blocks a lot of glare and heat and looks sharp on most vehicles. Like 5%, it’s too dark for front side windows under California law, so it lives on the back glass.
35% Tint
Thirty-five is the sweet spot for a lot of drivers. It gives a clearly tinted, finished look while still letting you see out well, day or night. From outside you can see into the car more than you’d expect, but the shade reads as a real tint, not a whisper.
It’s about the darkest shade most people can drive with at night without trouble. In California, though, 35% belongs on the rear glass. Front side windows have to let in more than 70% of light, and a 35% film falls far short of that before factory glass even enters the math.
50% Tint
Half the light in, half out. Fifty percent doesn’t look especially dark, but it does real work: cutting glare, blocking heat, screening a good chunk of UV. It’s a common pick for drivers who mostly want comfort and sun protection instead of a dark look.
Because it looks light, 50% is the shade people ask about most for the front side windows. It still doesn’t pass. California requires front side windows to let in more than 70% of light, and a 50% film lets in about half, before factory glass darkens it further. Keep 50% on the rear windows. If you want heat protection up front, ask about a clear ceramic film that keeps the glass legal.
70% Tint
Seventy percent is nearly invisible. You’d struggle to tell it’s there from a few feet away, and you can see straight through it in any light. So why bother? Because a quality 70% ceramic film still blocks UV and a good share of heat while barely darkening the glass.
It’s a good pick for the rear windows when you want heat protection without a tinted look. It still isn’t legal on California front side windows. The law only allows clear film up front, rated to let at least 88% of light through, and a 70% film misses that no matter how clear your factory glass is. So the honest answer to “how dark can I legally go up front here?” is clear film, not 70%.
Window Tint Levels at a Glance
| VLT % | How it looks | Common use | CA front side windows |
|---|---|---|---|
| 5% | Blacked out, can’t see in | Rear privacy, limo look | Not legal |
| 20% | Clearly dark | Strong rear privacy | Not legal |
| 35% | Noticeably tinted, still see-through | All-around darkest comfortable | Not legal |
| 50% | Lightly tinted | Heat/glare/UV, subtle look | Not legal |
| 70% | Nearly clear | Heat/UV protection, factory look | Not legal |
| 88%+ (clear) | Looks like bare glass | Front side windows, UV protection | Legal, with installer certificate |
What’s Legal in California
California’s tint rules come from Vehicle Code section 26708, and they split by which window you’re tinting:
- Front side windows (driver and passenger): clear, colorless film only. The film has to let at least 88% of light through on its own, the window has to measure at least 70% with the film on, and the film has to block UV. You also need to keep a certificate from the installer in the car. No tinted film passes, 70% included.
- Rear side windows and rear windshield: any darkness is allowed. For the rear windshield, the vehicle needs outside mirrors on both sides, which nearly every modern car has.
- Windshield: a non-reflective strip is allowed along the top, as long as its bottom edge sits at least 29 inches above the driver’s seat. It can’t be red or amber. Below that line, the glass stays clear.
- Reflectivity: the windshield strip can’t throw more glare than the glass itself, and front side film has to be clear and colorless, so mirrored film is out up front.
California’s medical exemptions are narrower than most people think, and neither one allows dark film up front. With a signed letter from a licensed physician or optometrist, you can use a removable sun shade on the front side windows, like a roller shade or a framed screen that lets in at least 35% of light. It can’t be film stuck to the glass, and it has to come down after dark. Separately, a certificate from a licensed dermatologist allows clear UV-blocking film, rated 88% or higher, on any window, including the windshield.
So you can go as dark as you want in the back, but the front seats have a hard limit. A shop that installs to California spec will get you privacy where it’s allowed and keep you legal where it counts. For the full breakdown, see our California window tint law guide.
Which Level Should You Pick?
- Want maximum privacy and a blacked-out rear? 5% or 20% on the back glass.
- Want a clearly tinted look that still lets you see out well? 35% on the rear windows, with a clear legal film up front.
- Mostly after heat and UV comfort? A clear ceramic film up front that keeps the glass legal, with 50% or darker in the rear.
- Want the windows to look factory while blocking heat? Clear ceramic film on the front, your call in the back.
The right pick usually isn’t one number for the whole car. A common legal setup is clear film up front and something darker in the back for privacy. You get the legality where it matters and the privacy where it’s allowed.
Frequently Asked Questions
Q: What’s the darkest legal tint in California?
On the front side windows, no tinted film is legal. You can add clear film rated 88% or higher, as long as the window still measures at least 70% with it on. The rear side windows have no darkness limit, and neither does the rear windshield as long as your vehicle has dual side mirrors, so you can run 5% back there.
Q: Is 35% tint legal in California?
On the back windows, yes. Any darkness is fine there. On the front side windows, 35% is too dark on its own, because those windows have to stay above 70% VLT. A medical exemption doesn’t change that. A doctor’s letter allows a removable sun shade up front, not 35% film.
Q: What does 20% tint look like?
Clearly dark from outside, with a faint outline of what’s inside visible in bright light. It reads as a strong, obvious tint without being fully blacked out like 5%.
Q: Will darker tint block more heat?
Not necessarily. Heat rejection comes from the film’s technology, not its shade. A good 70% ceramic film can block more heat than a cheap 5% dyed film.
Q: Can I get a ticket for illegal tint in California?
Yes. Any tinted film on the front side windows can draw a fix-it ticket, and so can a front window that measures under 70%. Installing to California spec from the start avoids the hassle.
Ready to Tint the Right Way?
We tint to California spec, so you get the privacy and heat protection you want without the ticket you don’t. Get a free quote or contact us to talk through the right level for your vehicle.
