Kestävä kehitys
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Lue lisääReflection
This is the property of materials to reflect light. There are different types of reflection, such as mirrored, mixed, fully diffused and irregularly diffused reflection. Indoor lighting uses diffused reflection almost exclusively.
The reflective behavior of a material is expressed by the reflection factor r. This is the ratio of the luminous flux reflected by the material to the luminous flux incident on the material (r= F/ F0).
The reflection factor (reflectance) is specified in most cases for diffused incidence of light (rdif) or quasi-parallel incidence of light under 80 (r). In lighting technology the value mostly used is rdif. In theory, the maximum value for r and rdif is 1 (100%).
Reflectances of the most common colors and materials:
| Color | r | Material | r |
| White | 0,8 | Plaster | 0,8 |
| Light yellow | 0,7 | Tiles, white | 0,7 |
| Light green, pink | 0,4 | Maple, birch | 0,6 |
| Sky blue | 0,4 | Light oak | 0,4 |
| Light grey | 0,4 | Concrete | 0,3 |
| Light brown | 0,3 | Dark walnut | 0,2 |
| Mid-grey | 0,2 | Dark oak | 0,2 |
| Dark red | 0,1 | Red brick | 0,2 |
| Black | 0,1 | Breeze block | 0,1 |
