Fraunhofer Institute for Building Physics
Light transmission and reflection of façades
Energy Efficiency and Indoor Climate
| Measurement | Directed-directional light transmission and light reflectance (luminance coefficients, BRTDF), directional-hemispherical light transmittance and reflectance |
| Standards | DIN EN 410, DIN EN 13363, DIN EN 14500, DIN EN 14501, DIN V 18599-4 |
| Measurement objects | Glass, Complex Fenestration Systems (CFS) like functional glass types (e.g. printed glass, glass for light control), blinds, textile sun protection, glass-sun protection composites, systems for skylights |
Technical data
| Light source | D65 spectrum, opening angle 0.34° Exposure to sample: elevation angle of 0° up to 84° Azimuth angle: 0 to 360° |
| Sensor system | Spatially resolved measurements by luminance camera (2°) Monochromatic, 3 color channels, circadian action spectrum c(λ) |
| Sample size (L × W × H) | 600 mm x 600 mm x 30 mm |
Special features
| Automatic sample positioning | Highly automated measuring device. Inter alia louvre angle of blinds can be set automatically. |
| Further use of the data in planning | Software-based data analysis. The recorded data may inter alia directly be used in light simulation programs such as DIALux to evaluate the façades photometrically and energetically. |
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- to the working group Lighting Technology and Passive Solar Systems' (ibp.fraunhofer.de)
- to the department Energy Efficiency and Indoor Climate (ibp.fraunhofer.de)