Reflectance
The reflectance is the ratio of reflected to incident luminous flux with diffuse light incidence. For the measurement, an Ulbricht sphere according to DIN 5036 Part 3 and a calibrated reflectance standard with a known reflectance are used. The measurements of the reflectance are carried out with a halogen light source, which is operated with overvoltage in order to be able to illuminate with the most neutral white possible. The reflectance depends on the irradiated spectrum (the light colour).
Reflectance measurements of LIGNATUR surfaces
Reflection measurements of LIGNATUR surfaces. The spectral reflection values are converted to the correspond-ing standard light types. In addition, we calculate the reflection behaviour when irradiated with a typical LED light source with 4000 K.
Different sample surfaces were measured. The samples were about 20 cm x 30 cm in size. In order to measure the most representative reflection value possible, the measured values were recorded and averaged at 6 different points.
Reflectance LIGNATUR
The reflection behaviour in case of irradiation with a typical LED light source with 4000K based on the measured spectral reflection values is:
60% reflectance
-856 K change colour temperature
2.85 dc*1000 change green-purple
59% reflectance
-686 K change colour temperature
2.58 dc*1000 change green-purple
76% reflectance
-168 K change colour temperature
0.52 dc*1000 change green-purple
70% reflectance
-215 K change colour temperature
0.27 dc*1000 change green-purple