What VLT Percentage Should You Choose? Tint Darkness Guide (2026)

VLT stands for Visible Light Transmission, the percentage of light that passes through your glass and film combined. A 100% VLT lets everything through, while 5% VLT lets almost nothing in and looks close to black from outside. Factory side glass on most Australian cars sits around 70% VLT before any film goes on, which trips up a lot of people comparing tint percentages.

Here is the tricky bit installers deal with daily: when someone asks for "20% tint" on a car, they usually mean a film that brings the total VLT down to roughly 20%, not a film that is 20% on its own. The film itself might be rated at 30-35% because it is stacked on top of glass that already blocks some light. This matters when you are comparing quotes, so always ask whether the number quoted is the film rating or the resulting total VLT on the glass.

How the common percentages behave in real life

Tint darkness is not just about looks. Heat rejection, glare control and how much detail people can see into your car or building all shift as VLT drops, but the relationship is not perfectly linear because film technology (dyed, carbon or ceramic) plays a bigger role in heat performance than darkness alone.

Front windows versus rear glass

Most state road rules set a minimum VLT for the front side windows that is lighter than what is allowed on the rear windows and back glass, since drivers need clear vision for mirrors and lane changes. This is exactly why so many cars in Australia run a lighter shade up front and a darker shade from the B-pillar back, sometimes called a two-tone or staggered tint job.

Because legal minimums vary between New South Wales, Victoria, Queensland, Western Australia and the other states and territories, do not rely on a percentage you saw on a forum or a mate's car interstate. Check your own state's tint law guide for the exact figures before booking, and make sure your installer confirms compliance in writing.

Residential and commercial jobs are not bound by the same road rules as cars, so the choice comes down to comfort, glare, privacy and how much natural light you want to keep. A 30-50% VLT solar film is the most common pick for living rooms, home offices and west-facing windows that cop harsh afternoon sun, because it cuts heat and glare while still letting the room feel bright.

Frosted and privacy films work differently again, since many are designed for bathrooms, ensuites, meeting rooms or ground-floor windows facing the street, and the decision there is more about obscuring the view than managing heat. Ceramic films at higher VLT, often 40-70%, are popular in offices that want strong heat and UV rejection without visitors noticing much darkening on the glass from the footpath.

Matching VLT to the room

• West and north-facing rooms with strong afternoon sun: 30-50% solar or ceramic film
• Home offices or media rooms wanting reduced glare on screens: 20-35% film
• Bathrooms, street-facing glass needing privacy: frosted film, VLT is less relevant than the frosted pattern itself
• Shopfronts wanting a premium look with heat control: 40-60% ceramic film

VLT percentage itself does not set the price, film type and quality do. A 20% dyed film and a 20% ceramic film will look almost identical on the glass but perform very differently in heat rejection and how long the colour lasts before fading.