35% Window Tint: How Dark It Is and Where It’s Legal In Hawaii

Updated November 2026 for Hawaii’s Act 129 tint rules.

We’ve tinted cars in Honolulu since 1982, and “how dark is 35%?” is still one of the first questions at our counter. Here’s what 35% tint looks like, how it compares to 50%, 20% and darker shades, what Hawaii law allows window by window, and how to get the most heat control out of it.

Tint percentages measure visible light transmission (VLT): the share of visible light that passes through the window. The lower the number, the darker the glass. A 35% film lets 35% of visible light through and blocks the rest.

One detail matters a lot in Hawaii: factory glass isn’t perfectly clear, and the law measures the glass and film together. Combined VLT is roughly the glass VLT multiplied by the film VLT. For example, if a window lets 80% of light through on its own, a 35% film on top of it gives about 28% (0.80 × 0.35). That’s why we meter your front windows before recommending a shade.

35% sits in the middle of the range. From outside, it gives a car an even, darker look without looking blacked out. From inside, the view stays clear in daylight and at night.

Comparing two shades? See our side-by-side look at 20% window tint and our guide to 50% window tint.

Hawaii’s tint rules are in Hawaii Revised Statutes §291-21.5, which was updated by Act 129 (2025). Here’s how they apply to a car with 35% tint:

Before Act 129, sedans had to keep 35% on the rear windows too; trucks, SUVs and vans already had the rear exemption. The 2025 change brought sedans in line. As T&T CEO Kyle Horimoto told Hawaii News Now when the law was signed, front side windows still have to be 35%, while rear windows can go to 15% or 20%, or even 5%.

The statute also sets fines of $300 to $550 per offense for a vehicle owner and $700 to $1,200 for the installer, and requires the installer to give you a compliance certificate that stays in the car. Act 129 also requires people in vehicles with tint to roll their windows fully down at a traffic stop. For every rule in one place, read our guide to Hawaii tint laws.

It can, but the shade isn’t what does most of the work. According to the IWFA Automotive Education Guide (2026), about 44% of the sun’s energy reaching the earth is visible light, about 53% is infrared and about 3% is ultraviolet. A film that only darkens the glass deals mainly with the visible part. Films built to block infrared, such as ceramic films, can keep a car cooler at 35% than a cheaper film at a darker shade.

That’s why we compare film lines by total solar energy rejected (TSER), the share of the sun’s total energy a film keeps out, alongside the shade. Read more about TSER, glare and heat and ceramic vs carbon tint.

For most Oahu drivers, yes. A good 35% film:

If you want more privacy, the usual answer in Hawaii now is 35% on the front side windows and a darker shade on the windows behind the driver.

You often don’t have to choose. On the front side windows, Hawaii’s limit points to 35%. On the windows behind the driver, 20% gives noticeably more privacy and still lets in some light, while 35% keeps the whole car the same shade. If you drive a lot at night or on unlit roads, many drivers prefer to stay lighter. Our 20% window tint guide shows how much darker 20% looks.