Tint Heat Rejection Explained: VLT, IR and TSER

If you are comparing tint quotes in South Florida, you will run into three acronyms: VLT, IR and TSER. Shops love quoting whichever number makes their film look best. Here is what each one actually measures and which one you should care about.

VLT: How Dark It Looks

Visible Light Transmission is the percentage of visible light the window lets through. It is a measure of darkness and legality, not performance. Florida requires more than 28% VLT on front side windows and more than 15% on rear sides and rear glass. VLT tells you nothing about how cool your car will be.

IR Rejection: The Number Shops Love

Infrared rejection sounds like the important one, and it is where you see big marketing numbers like 95% or 98%. The catch is that IR rejection is often measured at a single cherry-picked wavelength rather than across the whole infrared band. A film advertising 98% IR rejection at one wavelength can perform far worse across the real spectrum of sunlight.

It is a useful number, but only when it is measured across a range, and it is not the whole picture.

TSER: The Number That Actually Matters

Total Solar Energy Rejected is the one to ask about. TSER accounts for everything the sun throws at your car: visible light, infrared and ultraviolet, weighted by how much energy each part actually carries. It is the closest thing to a single honest answer to how much cooler this film will make my car.

• ▸Untinted factory glass: roughly 20% TSER
• ▸Dyed film: roughly 35–45% TSER
• ▸Carbon film: roughly 45–55% TSER
• ▸Ceramic film: roughly 55–65% TSER
• ▸Nano ceramic film: roughly 65–80% TSER

Notice that a light nano ceramic film can beat a very dark dyed film on TSER while being far more legal and far easier to see through at night. That is the whole argument for paying for good film instead of just going dark.

What About UV?

Almost any quality film, ceramic or not, blocks 99% of UV. That is the easy part. UV rejection is what protects your dash, seats and door cards from cracking and fading, and it protects your skin on long drives. It is worth having, but since nearly every decent film does it, it should not be the deciding factor between quotes.

How to Compare Quotes

Ask three questions: what is the film brand and line, what is its TSER, and what does the warranty cover. If a shop can only tell you how dark it goes and how cheap it is, you are being quoted on dyed film. At our Sunrise shop we will tell you the exact film, the exact numbers, and what it will do in a car that parks outside in Broward County.