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Understanding Window Tint Visible Light Transmission

Whether it’s for a car, home or commercial use when referring to window tint film, one of the most important features is how much light the tint allows to pass through. This is critical in most applications when attempting to gage how much security , privacy and protection a tint offers from heat and harmful UV rays. Nevertheless, in automotive applications it is particularly critical since a number of states have laws limiting how dark the tint can be on the windows of a car. As a result , manufacturers of window tinting have developed a method for calculating how much light a tint requires it to pass. And when considering the darkness of a window tint, there are a few things to remember. Checkout Window Tint near me.

All window tint film is measured by the visible light transmission rates (VLT) of the components, regardless of the application. To put it simply, the VLT value is the percentage of visible light that the tint allows from the outside of a vehicle, building or home to the inside. The lower the amount of VLT, the darker the tint is and the more light it absorbs from outside. A tint with a VLT value of 5 percent means that the window film only allows 5 percent of the outside light to pass through it, while a film with a VLT value of 50 percent allows 50 percent of the outside light to pass through. However, as tints are also offered in a variety of colors when professionals refer to a tint they typically define it by the color and VLT value of the tint. A charcoal colored tint with a 5% VLT is known as charcoal 5%, for example. Similarly, a 50 percent VLT green colored tint film is called green 50 percent.

While many may believe that the only factor to consider when measuring the final VLT of the mounted window tint is the VLT of a filter, there is one additional aspect that needs to be considered. Each piece of glass blocks a certain amount of light, no matter what the application. As a consequence, glass also has its own VLT value which has to be taken into account to determine the final VLT value of the mounted tint. For example, if a state law stated that the lowest legal VLT value for a tinted car window was 30 per cent and a person installed a tint with a 30 per cent VLT rating, the final VLT rating for windows would actually fall below the legal limit due to the natural VLT value of the window. For this reason window tinting professionals use a simple formula to calculate the final VLT value of the installed window tint:

V1 (VLT glass value) x V2 (VLT tint value) = V3 (End VLT value)

For example , let’s assume that the legal limit for a vehicle’s window tint is 30% and that the vehicle glass has a VLT value of 75%. In this case, since we already know the window’s VLT value and the final VLT value that we want to achieve, we just need to rearrange the formula to calculate the right tint to add as follows:

V3 (final VLT value) Ø V1 (VLT of glass) = V2(VLT of tint value)

0.30 (30 percent) unter 0.75 (75 percent) = .40 (40 percent)

Installing a window tint with a 40 per cent VLT value would result in a final VLT value of 30 per cent as desired, according to this formula. Professional installers using this formula save their customers a significant amount of money not only in traffic tickets for illegally tinted windows but also in reinstalling the window tint that most traffic courts require when a driver receives a ticket for illegally tinted windows.