"Window tint" and "solar film" often get used for the same thing, and both are thin films applied to glass. But they're built for different jobs, and the numbers on a spec sheet tell you which one you're looking at.
The short answer
- Window tint usually means film that makes glass darker: for privacy, looks or glare. Car tint is the best-known example.
- Solar film is engineered to reject the sun's heat. Some solar films are dark, but some are nearly clear and still block a large share of solar heat.
So a film can be dark without rejecting much heat, and light without letting much heat in. Darkness and heat rejection are separate numbers.
The numbers that matter
| Figure | What it means | Higher is… |
|---|---|---|
| Visible light transmitted (VLT) | How much daylight gets through. The "35%" in a shade name | lighter |
| Total solar energy rejected (TSER) | How much of the sun's heat the glass-and-film blocks | cooler |
| UV rejected | Protection from fading and sun damage | better |
| Glare reduction | How much less glare than clear glass | less squinting |
| Exterior reflectance | How mirrored it looks from outside, and how much daytime privacy you get | more private (daytime) |
A real example: light film, real heat rejection
Compare two films we cut, from their spec sheets:
- SnapTint Nano Ultra Vision 70 lets through 67% of visible light, so the glass looks almost untreated, and it rejects 40% of solar energy.
- SunTek Symphony Neutral 35 lets through 35% of visible light, so the glass looks clearly tinted, and it rejects 60% of solar energy.
Both block 99% of UV. If you want a cooler room without a darker room, a light solar film like Nano Ultra Vision is the one to look at. If you also want privacy and glare control, a darker or reflective film does more.
Car tint vs. home window film
We cut both, and they aren't interchangeable:
- Car tint is made for curved automotive glass and is cut to your vehicle's exact window shapes. How dark you can go depends on your state's tint law.
- Home and office film is made for flat architectural glass and is cut to your window measurements. There are no tint laws for homes, but check the film maker's guidance for your glass type (for example double-pane or already-tinted glass) before choosing a dark or highly reflective film.
Which do you need?
- A cooler room, same view: solar window film, starting with the lighter shades.
- Less glare on screens: heat and glare film.
- See out, not in, during the day: daytime privacy film.
- Stop fading, keep clear glass: clear UV film.
- Your car: find your precut kit.
Still deciding? Order samples and compare them on your own windows.