Download Operating instructions

8.2 Colour rendering
One way of showing the colour impression is the standard chart as per DIN 5033 – basic stimulus.
Colour is a sensory impression conveyed by the eye.
The evaluation of a colour stimulus by the eye causes
a uniform effect (colour stimulus specification). This
can be described by colourimetric numbers (e.g. x,
y and z in the CIE 1931 or CIE 1976 colour space or
L, a and b in the CIE 1976 (L*a*b*) space or W, U and
V in the CIE 1964 colour space (W*, U*, V*)). But the
perceived colour (the subjective impression) depends
on the general conditions (colour mood, surrounding
surfaces, luminance).
The primary colours, i.e. saturated monochromatic colours, run around the periphery of the colour triangle.
An ideal black body (or Planck radiator) radiates an
electromagnetic spectrum depending on its temperature. The colour thus depending on temperature is
depicted in the Planck curve, this is the so-called
“colour temperature”.
Colours on the Planck curve are marked with the
corresponding colour temperature; chromaticity coordinates deviating only slightly from the Planck curve
(within the range of the Judd straight lines, corresponding to a distance of approx. 5.4 threshold
value units) are marked with the correlated colour
temperature.
Fig. 50: Standard colour chart as per DIN 5033
Reference color temperature 4000K
HQL-Standard
HCI - NDL
R1: 46
R1: 99
R2: 61
R2: 97
R3: 54
R3: 88
R4: 46
R4: 96
CRI: 50
R5: 43
R5: 97
R6: 36
R6: 95
R7: 66
R7: 96
R8: 44
R8: 93
Fig. 51: Defining the colour rendering indices in comparison for two light sources
48
CRI: 95