SerraGlaze Daylight Redirecting window Film is a specialty product; due to the light redirecting (light bending) properties of the film. It is hung above eye-level and is applied to either daylighting windows or simply in the upper portion of a view window. It is available in both see-through (SerraGlaze Select) and privacy (SerraGlaze Diffuse) versions. And, unlike typical window film which comes in rolls and cut on the window, we deliver the product custom coated, pre-cut for each window, and ready to hang.
SerraGlaze Select also reduces the perception of haze, providing a clearer view out the window from most viewing positions
SerraGlaze Select is available in several frit coating densities, enabling the selection of film most suitable in achieving recommended light levels for the space. The frit attenuates the amount of the natural light entering the windows, further reduces glare and provides a visually crisp view out.
Windows oriented towards the equator typically need modest attenuation such as SerraGlaze Select-70, before redirecting sunlight to the ceiling, whereas East and West facing windows–in the direction of the rising and setting sun–may need to block more of the light to avoid the glare of a low sun so SerraGlaze Select 50 or 60 may be best.
In 2017, SerraLux announced our next generation of SerraGlaze Daylight Redirecting Film (“SerraGlaze Gen 2”). This new generation further enhances daylight penetration. We also offer two variations of the film, SerraGlaze Select (transparent/see-through) and SerraGlaze Diffuse (translucent/privacy). Both films are comprised of the same base film however varying coatings allowing optimal results.
SerraGlaze-D (Diffuse) is designed for applications where views are not important or privacy is desired.
Currently, SerraGlaze-D is available in D-4, having a diffusion angle of ±4 degrees for a total diffusion of 8 degrees. The SerraGlaze-D film spreads the redirected light by diffusing it, while reducing the ability to see the detail of objects through the window.
As mentioned, latitude, orientation, use of the space, and other factors can influence the amount of daylight desired. The closer one is to the equator, the higher the sun will pass through the sky, and vice versa. It is important to understand the path of the sun throughout the year when determining the right daylighting film for the space. Additionally, the building and window orientation is important as to how high/low the sun will be when considering daylight and glare control needs of the targeted space on a year-round basis.
Due to the light redirecting technology built into the SerraGlaze film, it is intended to be applied above eye-level on the window. Windows which could benefit from SerraGlaze are those above eye-level or in the position of the “daylighting” portion of a window. This would include clerestory windows as well as the upper portion of a standard “view” window.
SerraGlaze works 24×7, i.e. direct sunlight as well as sky light will be redirected upward to the interior of the space when coming in contact with the film. The glazing space below the film in many cases will still require the blockage of direct light or glare. For each window, it is important to determine how much glare remains (which SerraGlaze does not control).
Direct sun access to the lower portion of the window will take part in that determination. Overhangs, trees, neighboring buildings and other visual obstructions need consideraton. Key analysis will be studying the sun’s year-round path for the location and orientation of the building.
For an example, the charts and graphs here are specific to Seattle, Washington which is at 48 degrees above the equator. Taking the orientation in mind it may not be necessary to have blinds or some type of shading device in the lower portion of the window.** To achieve optimal lighting levels, planning should account for full-spectrum natural light to be diffused deeply into the room while at the same time managing glare.
Daylight modeling is a very helpful during the design and planning process. There are various daylight modeling tools which allow the testing and simulation of integrated daylighting and shading materials by providing daily and year-long metrics such as UDI, sDA, cDA. Daylighting tools for showcasing sustainable design can be used to visualize how SerraGlaze reduces glare and increases beneficial daylight in a space. And, some offer annual metrics and key time simulations with scorecards for key industry and LEED standards.
** In orientations where the sun elevation is below 30 degrees for meaningful portions of the day, it is desirable to have blinds or to attenuate the daylight admitted, such as with SerraGlaze Select 50.