Unit of measure : candela per m² (cd/m²)
Luminance is the basic luminance perceived by the human eye. It is decisive for the impression of brightness of a luminous or illuminated surface.
Luminance L is defined by the luminous intensity Iε of an area A in the direction ε
A * cos ε is the "seen area" from direction ε
If diffuse reflection (Lambert radiators) is assumed for an illuminated surface, a simple relationship between luminance L and illuminance E of this surface results:
ρ = reflectance of the surface
The distribution of luminance between various surfaces in an illuminated interior is an important criterion for the quality of the visual experience. A balanced and harmonious distribution of brightness makes a room pleasant and visually interesting (cf. Brightness, Contrast, Uniformity).
| cd/m² |
Sonne je nach Sonnenstand | 600.000 ... 1.600.000.000 |
Glühlampe matt | 20.000 ... 50.000 |
Kompakt-Leuchtstofflampe | 9.000 ... 25.000 |
Leuchtstofflampe | 4.000 ... 17.000 |
Arbeitsgut im Büro | 100 ... 200 |
Bildschirme | 20 ... 200 |
Umfeld im Büroraum | 10 ... 100 |