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:
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 - 5000 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