In choosing window film, we often find film glass specifications that generally contain terms such as TSER (Total Solar Energy Rejection), IRR (Infrared Rejection), UVR (Ultraviolet Rejection), and Visible Light Transmission (VLT). Pay close attention to those terms before you buy window film.


One of the important things in window film is the amount of VLT (Visible Light Transmittance) or light transmission (visible). The magnitude of this VLT shows the amount of light entering into the cabin. If the smaller the value of VLT the more visible dark glass film. Consider also the effects of the darkness of your window film while driving while the heat and heavy rain.

So it is not wise to install a film glass that is too dark, maybe to drive in the daytime is not too felt, but this will require extra work of view while driving at night or heavy rains.

In the market, film glass consumers classify window films based on the level of darkness, which in turn is the exact opposite of the glass film specification data using VLT.

VLT 60% - 75%: Darkness of window film 20%

VLT 50% - 59%: Darkness of window film 30%

VLT 30% - 49%: Film glass darkness 40%

VLT 11% - 29%: Dark film glaze 60%

VLT 2% - 10%: Film glass darkness 80%

As for example VKOOL70 has a VLT of 70% which means 70% of visible light can penetrate window film. In the market, this film glass is said to have a 20% darkness. The greater the VLT number, the more clear the glass of the film.

For more than 20 years, V-KOOL 70 is the most widely used V-KOOL product, thanks to the high visibility of high visibility and maximum rejection of heat. V-KOOL 70 passes 70% visible light and rejects 94% of infra-red heat rays.


Infrared rays represent about 53% of solar energy. The remaining energy from the sun comes from visible light of 44% and a small portion of ultraviolet light (3%). All of these 3 electromagnetic waves make up what is known as the solar spectrum and its combined energy is what we see when we use the terms total solar energy.

Total Solar Energy Rejected (TSER) is a metric that describes the total amount of solar energy (UV + visible light + IR) that is blocked, or rejected, through the window.

TSER is the percentage of total sunlight that is rejected by the window film. This is the main film glass specification that we must see in choosing a good window film in reducing solar heat. The TSER number is affected by VLT, Infrared Rejected, Ultraviolet Rejected, and other elements. Sunlight consists of 53% infrared rays, 44% visible light and 3% UV rays.

Total Solar Energy Rejected (TSER) is the percentage of total rejected solar energy. TSER includes visible light, infrared radiation and ultraviolet light. The higher the percentage, the higher the percentage of solar energy being deflected. Generally, Infra Red Rejection (IRR) is used as a guide for heat rejection rates.

In non-visibility film glass functions such as the use of window film on the building, TSER can be used as a guide. But in vehicle applications, especially windshield, you should pay more attention to the VLT and IRR figures because it concerns the ease of your visibility when driving.

Movies with higher TSER does not necessarily mean the movie performs better. High TSER (Total Solar Energy Rejected) also means the film is much darker or highly reflective. So the best way to judge between movies is to compare the film with the same VLT (visible light transmission).


UV Rejection / Blocked is a marking of the size of the ultraviolet ray film glass to enter the car. For the greater the reading will be better, because if this light into the car in the long term can damage the dash, leather upholstery, color fade b even the dangers of skin cancer and cataracts. Generally, window films on the market have UVR above 90%.


VLR (Visible light Reflentance) is a specification that shows the visible light reflected. VLR number is getting bigger then aka glass window is more like mirror. VLR is important if you want to install the glass film on the windshield, avoid a large VLR so that the reflection of the car's interior to the windshield that interfere with the view does not occur. If the numbers are smaller then the better, meaning fewer reflections in the window film


Infra red Rejection is a measurement for electronic radiation that has heat energy in other words infra red rejection this means the ability to resist heat, for the reading is the greater the percentage then aka