Luminance L
Unit of measurement: candela per square metre [cd/m2]
1 [cd/m2] = 0,0001 cd/cm2
Luminance L is measured brightness of a light source or an illuminated surface. The eye is very good at distinguishing between different luminance values:
| Light source |
Average luminance [cd/m2] |
Light source |
Average luminance [cd/m2] |
Xenon short-
arc lamp |
200 000 - 5 000 000 000 |
Candle |
7 500 |
| Sun |
1 600 000 000 |
Blue sky |
5 000 |
|
Metal halide lamp
|
10 000 000 - 60 000 000 |
Specular louvred luminaire |
100 |
| Incandescent lamp |
2 000 000 - 26 000 000 |
Preferred values for indoor lighting |
50 - 500 |
| Compact fluorescent lamp |
20 000 - 70 000 |
White paper at 500 lx |
100 |
| Fluorescent lamp |
5 000 - 30 000 |
White paper at 5 lx |
1 |
| Sunlit clouds |
10 000 |
|
|
|
Luminance L
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