Retro reflection coefficient
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The retro reflection coefficient - a new descriptor
Commonly used methods (light reflection and light diffusion) does not explain the total experience of a ceiling surface. The retro reflection coefficient helps to complete the picture. This factor comes from a method developed to measure the painted lines on roads; how much light that is reflected back to the driver when driving on a dark road with the lights on. This is described in the standard EN 1436. The picture above describes the set-up. If we turn this setup upside down (see picture below), we can use the same standard to describe the light phenomena in a ceiling surface, something we could see but could not measure before. |
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Retro reflection coefficient - adapted to ceiling surfaces
The illustration shows how the method to determine the retro reflection factor is adapted to a ceiling in a room, where the light meets the ceiling at low angles. If the woman is standing in a room where the ceiling has a high retro reflection factor she will perceive the ceiling as being lighter, and the whole room will then appear lighter than if it had low retro reflection factor. The ceiling will also spread the light in a gentle and comfortable way. It will not pick up any colours from the windows or walls; it has visual integrity. Akutex FT has an optimal retro reflection coefficient compared to other ceiling surfaces - it has the same appearance no matter if the light source is placed behind you or in front of you. |