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System Performance | System Description | Case Study |
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System Performance
Due to the configuration of the film and its prismatic surface, the 3M OLF is a very reflective material that also permits the redirection and diffusion of light. This film can form part of a double glass unit or can be installed as a covering layer to transparent tubes. As a flat panel, it is able to redirect and filter straight-on sunlight while providing sun-shading, UV protection and a deeper penetration of diffuse light into the room. For this use, special attention must be paid to its positioning, because glare can occur if light is redirected downwards. This effect can be solved by seasonal adjustment of the film’s position, making dynamic systems, such as movable louvers, the best use of this film. The refraction of light partially distorts the view through the film, and creates colorful effects along both its surface and light pathways, what can be avoided by placing the system out of view areas. When used for light pipes, its high reflective surface allows for Total Internal Reflection between 0 and 27.6 degrees. This property enables the creation of macro fiber optics to transport light through long distances. Light can be released little by little along its way, to produce a uniform illumination, or at the end of the pipe. For a more advanced lighting analysis and project specific results, we recommend using the Lightsolve program (under development).
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Performance data for all systems in the same category. Comparison to systems in other categories, selected through the matrix filtering process.
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System Description
Made out of transparent optical grade polycarbonate, 3M OLF is a thin and flexible film with an array of 90º prisms on one face and a smooth finish on the other. Its prismatic surface has been made using microreplication technology, a process that allows the generation of precisely designed microsurfaces to achieve specific optical properties. This film is about .508mm (0.02”) thick, and is sold in rolls that are 0.95m (37”) wide and between 30m and 150m (99’ and 480’) long. When used in flat double glazings, the film should be placed inside the cavity with the smooth side next to the inner glass pane and the prisms facing outwards, to protect the delicate prismatic surface from dust and mechanical alterations. These glass units can be fixed or movable elements to enhance the efficiency of the system through a wider range of sun angles. When used in light pipes, the film covers the interior surface of a transparent tube made of polycarbonate or glass, in diameters of around 0.5m. 3M only commercializes the film for electric lighting devices and electronic displays; using the film in flat glazings and daylight tubes thus requires customized solutions. |
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