Understanding the Key Metrics

When comparing window films, a few key metrics tell you most of what you need to know.

  • Visible Light Transmission (VLT)

    This is the percentage of visible light that passes through the glass and film combined. A higher number means more natural light enters the room. A lower number means the room will be darker but with greater glare reduction and privacy. For example, a film with 17% VLT lets through very little light and appears quite dark, while a 67% VLT film allows most daylight to pass and looks almost clear.

  • Total Solar Energy Rejected (TSER)

    This measures how much of the total solar energy (heat + light + UV) is prevented from entering through the glass. A higher percentage means better heat rejection and a cooler interior. This is one of the most important metrics for comfort and energy savings.

  • UV Block

    The percentage of ultraviolet radiation blocked by the film. Virtually all professional window films block 99% or more of UV rays — protecting skin and preventing furnishings, flooring, and artwork from fading.

  • Visible Light Reflected (exterior)

    This tells you how much light is reflected back from the outside surface of the glass. A higher number means more of a mirror-like appearance from outside. Reflective films score high here, while spectrally selective films score low — maintaining a natural glass appearance.

  • Infrared Rejection

    Some films specifically target the infrared portion of the solar spectrum, which carries most of the heat energy. High infrared rejection means effective heat reduction without necessarily darkening the glass.

Film Types Explained

  • Solar Reflective Films (R Silver Series)

    Reflective films use a metallised layer to reflect a large portion of solar energy away from the glass. They are the most powerful option for heat rejection and are immediately recognisable by their silver, mirror-like exterior appearance.

    These films are ideal when maximum heat reduction is the priority and a reflective exterior look is acceptable. They also provide strong daytime privacy due to the mirror effect. The trade-off is reduced visible light transmission — rooms will be darker — and the reflective effect reverses at night when interior lights are on.

  • Spectrally Selective Films (SS Natural Series)

    Spectrally selective films represent the most advanced window film technology. Using nanotechnology, they selectively filter infrared radiation (the heat-carrying part of sunlight) while allowing a much higher proportion of visible light to pass through.

    The result is excellent heat rejection with minimal impact on the appearance of the glass — both from inside and outside. The building retains a natural, unaltered look, making these films particularly popular for residential properties, historical buildings, and any application where aesthetics are important.

    While they don't reject quite as much total solar energy as the strongest reflective films, the balance of performance and appearance makes them the preferred choice for most residential and many commercial projects.
Get A Quote

Our Most Popular Films

  • R Silver 20 X — Maximum Heat Rejection

    The darkest and most powerful reflective film in our range. Best suited for spaces where heat and glare are the primary concerns and a mirror-like exterior appearance is acceptable.

    Total Solar Energy Rejected: 85%

    UV Block: 99%

    Visible Light Transmission: 16%

    Visible Light Reflected (exterior): 62%

    Fire Certificate: DIN EN 13501-1 (B-s1, d0)

  • R Silver 35 X — Strong Performance, More Light

    A step up in light transmission compared to the Silver 20, while still delivering strong heat rejection. A good middle ground for spaces that need serious solar control but want more natural light than the darkest option allows.

    Total Solar Energy Rejected: 72%

    UV Block: 99%

    Visible Light Transmission: 31%

    Visible Light Reflected (exterior): 43%

    Fire Certificate: DIN EN 13501-1 (B-s1, d0)

  • SS Natural 45 X — The Best Middle Ground

    A popular film for residential clients who do not want a mirror-like look on their windows. It rejects a smaller amount of solar heat while maintaining a natural glass appearance and allowing nearly half the visible light through. Less effective at lowering heat indoors but a more natural look.

    Total Solar Energy Rejected: 69%

    UV Block: 99.9%

    Visible Light Transmission: 43%

    Visible Light Reflected (exterior): 19%

    Fire Certificate: DIN EN 13501-1 (B-s1, d0)

  • SS Natural 70 X — Maximum Light

    The lightest film in our popular range — allowing most daylight through while still providing meaningful heat rejection and near-total UV protection. Almost invisible once applied.

    Total Solar Energy Rejected: 61%

    UV Block: 99.9%

    Visible Light Transmission: 61%

    Visible Light Reflected (exterior): 22%

    Fire Certificate: DIN EN 13501-1 (B-s1, d0)
Learn More

Have A Project In Mind?

Reach out to us with any ideas, requirements or questions and we will help you find the right solution for your needs.