How to Calculate Window Tint Visible Light Transmission (VLT)

Window tinting films are measured in visible light transmission levels (or VLT). This means that when we discuss a particular film, be it for fitting to a car or any other application, we normally refer to it with it’s VLT value. VLT is measured in percentage ( % ), so if you hear about a tint product being referred to as a percentage, it is the VLT that defines that percentage value.

For example, a tinting film referred to as Charcoal 5% is a charcoal coloured tint with a VLT of 5% and likewise a film referred to as green 50% is a green coloured tint film with a VLT of 50%. But what does the number actually mean?

Well, in simple terms the VLT value is the percentage of visible light that will be allowed to travel through the window tinting film from the exterior face side of the film to the interior side. This means that a 5% film will only allow 5% light travel through and a 70% film will allow 70% light to travel. In effect, this means that lower VLT films will appear darker. For instance, it is normally 5% tints that we will see on limousines for privacy.

So, fitting a 5% tint to a window will allow 5% light to travel through the glass from outside to inside, right? NO! Because we need to take into consideration the actual VLT of the window before the tint is even installed. There is no such thing as a piece of glass, no matter how clear it appears, with a VLT of 100%. This is because glass naturally filters out a little bit of visible light.

Lets look at car window tinting as this is one area where we speak of VLT often due to the fact that many countries have laws in place limiting how dark car windows should be tinted. Most modern cars come from factory with windows reading a VLT somewhere between 72% and 78%, depending on manufacturer, model and country. Say, our example car’s windows read at 72% and we add a 50% window tinting film, what is the new and final VLT of our car’s windows after installation?

The sum is very simple: V1 x V2 = V3 (Where V1 is the original VLT of the glass before tinting, V2 is the VLT of the window tinting film and V3 is the final VLT value of the glass with tint film applied).

Our car’s windows original VLT = 72% and the tint = 50 %, thus V1 = 72 and V2 = 50

The sum is 72 x 0.50 giving us 36, which we will express as a percentage. So a window with an original VLT of 72% will then have a VLT of 36% after application of a 50% film.

Motorcycle Components

In our daily life, motorcycles are also catch people’s attention except for cars and bicycles. They are important transportation mode that we can not ignore. Motorcycles have been developed a lot through these years. Modern types are quite different from the earlier ones for that they can include high-tech components.

It is common that every product should depend on various parts to achieve the expected function, so do the motorcycles. They also need specific parts to function properly. Different components work together to keep the motorcycles in a good condition.

One of the most obvious and important parts is the wheel. Generally, there are two wheels on a motorcycle which featured steel spokes traditionally. But through the development, many other types can be found now such as the cast aluminum wheels and other alloy models. Usually, rear wheels may be larger and wider than front wheels because of their drive configuration.

Drivetrain is just like the heart of the motorcycle. It is powered by the drivetrain which includes the engine. Motorcycle engines are usually centrally mounted below the driver’s seat. It conveys power to the rear drive wheel through its   transmission . The  transmission  itself is attached to the engine, and operated by a shift lever and a clutch. And the system connecting the  transmission  to the rear wheel (the final drive) varies on different types of motorcycles, and may be a chain or belt, or a solid shaft.

Brakes are also necessary components on a motorcycle. They are controlled by a hydraulic system that is activated by handlebar or foot levers. Typically, disc brakes are offered on high end models or heavier motorcycles that require more powerful brakes.

Electrical system is an indispensable part. Sometimes, it is very complex. Some of the most basic electrical components are the lights, which include the headlights, tail lights, directional signals and brake lights. In addition, the instrumentation which includes the speedometer, tachometer and odometer is also an important part of this system.

Of course, there are still many other parts which also have significance to the motorcycles. They may be added to distinguish one model from another, or to prepare a motorcycle for a certain type of driving. All in all, all of the motorcycle parts are important for the proper function of the whole machine.