DE102014007178B3 - Method for sorting test light-emitting diodes into a color class - Google Patents

Abstract

The object of the invention is to propose an improved method for sorting light-emitting diodes as test light-emitting diodes.
Thus, the invention relates to a method for sorting test light-emitting diodes 1a, b into a color class FK, wherein in a step 100 from a basic quantity GM of the test light-emitting diodes 1a, b a coarse selection quantity GAM is sorted into an intermediate class ZK, the color words of the test light-emitting diodes 1a, b of the intermediate class ZK are arranged in a common first region of a first color locus, wherein the first color locus is set in a first color model having a first observer field size BFG1, wherein in a subsequent step 200 from the coarse selection set GAM of the test light emitting diodes 1a, b a fine selection set FAM in the Color class FK is sorted, wherein the color words of the test light-emitting diodes 1a, b of the color class are arranged in a common second area of a second color locus, the second color locus is set in a second color model with a second observer field size, wherein the first and the second observer field sizes formed differently s ind.

Description

The invention relates to a method for sorting test light-emitting diodes into a color class, wherein in one step from a basic set of test light-emitting diodes a coarse selection set is sorted into an intermediate class, wherein the color words of the intermediate-class test light-emitting diodes are arranged in a common first region of a first color locus, wherein the first color locus in a first color model having a first observer field size is determined, wherein in a subsequent step from the coarse selection quantity of the test light diodes a fine selection set is sorted into the color class, wherein the color words of the test light diodes of the color class are arranged in a common second region of a second color locus, wherein the second color locus is set in a second color model having a second observer field size, wherein the first and second observer field sizes are formed differently.

Light-emitting diodes have manufacturing tolerances on the light color. While it would be possible in principle to further reduce the tolerances in the production, it has gone over to produce the LEDs with respect to the light color tolerant and to sort the light emitting diodes below in color classes. This process - also called binning - is implemented in such a way that the light-emitting diodes are sorted into different classes, so-called bins, with reference to their light color. On the user side, light-emitting diodes can then be ordered from a "bin", so that no tolerances or variations in the light color occur even with a combination of a plurality of light-emitting diodes in a lighting device.

From the US 2014/0028699 A1 For example, a color display system is known which provides reduced observer metamerism errors to a number of observers with a narrowband primary color imaging system. A data processing system is used to implement a method for color correcting an input color image having input color values adapted for display on a reference display device having a plurality of input primary colors. A metamerism correction transformation is applied to the input color image to determine an output color image having output color values in an output color space suitable for display on the image processing system. The metamerism correction transformation modifies the colorimetry of the input colors to provide output color values such that an average viewer metamerism error is reduced for a distribution of target observers.

From the US 2012/0224177 A1 LED-based lighting modules are known that are visually color-coordinated with light sources that are not based on LEDs, based on optically matched color spaces. An optically tuned color space is used to tune both instrumentally and optically an LED based light source with a non-LED based light source. In one aspect, an LED based lighting module is implemented to achieve a target color point in an optically adjusted color space within a predetermined tolerance. In another aspect, an LED-based lighting module is implemented to optically match a non-LED based light source. A target color point in the CIE 1931 XYZ color space is derived based at least in part on the spectrum of the optically tuned LED based illumination module. LED-based lighting modules that are optically tuned to non-LED based light sources are realized based on the derived target color point.

The WO 2012/119158 A1 relates generally to optical filters which provide regulation and / or enhancement of the color and light aspects of the color impression of light in human vision, generally the applications of such optical filters, the therapeutic use of such optical filters, industrial and safety applications of such optical filters, if any For example, in radiation goggles, methods of designing such optical filters, methods of making such optical filters, and embodiments and methods of incorporating such optical filters in devices including, for example, goggles and illuminants.

The object of the invention is to propose an improved method for sorting light-emitting diodes as test light-emitting diodes. This object is achieved by a method having the features of claim 1. Preferred or advantageous embodiments of the invention will become apparent from the dependent claims, the following description and the accompanying drawings.

The invention thus relates to a method for sorting test light-emitting diodes into a color class. Under the test light emitting diodes is a plurality of light-emitting diodes understood, which are preferably identical in construction and / or which should be sorted. In alternative embodiments of the invention, however, structurally different test light-emitting diodes can be used. The color class defines prefers a "bin". In particular, several color classes, in particular bins, can be provided, the test light diodes being distributed in the color classes. The color classes preferably differ from one another by the underlying color terms, as shown below.

In the method, a coarse selection quantity is sorted into an intermediate class in one step from a basic set of the test light-emitting diodes, that is to say from a certain number of the test light-emitting diodes. Another part of the basic amount is z. B. in other intermediate classes or completely sorted out. In particular, all test light-emitting diodes in the intermediate class each have a color locus which is arranged within a common first region of a first color locus. Thus, in the intermediate class, all test light-emitting diodes end up from the basic quantity which correspond to the first color locus or whose distance, in particular their color locus distance, to the first color locus lies below a predefinable limit value and / or tolerance value. The first color locus is determined in a first color model having a first observer field size, in particular using a first spectral value function set for the first observer field size.

In a subsequent step, a fine-selection set is sorted into the preferably final color class from the rough selection set of the test light-emitting diodes in the intermediate class. Thus, starting from all test LEDs in the intermediate class, a subset is taken over into the color class. The remaining test light diodes from the coarse selection amount z. B. sorted into a different color class or sorted out. The test light-emitting diodes in the color class each have a color locus which is arranged in a common second region of a second color locus. Thus, in the color class, all test light-emitting diodes from the intermediate class which correspond to the second color locus or whose distance, in particular their color locus spacing, to the second color locus lie below a predefinable limit value and / or tolerance value. The second color locus is defined in a second color model with a second observer field size, in particular using a second spectral value function set for the second observer field size.

The first and the second observer field sizes are designed differently, in particular the first observer field size is defined with a first viewing angle and the second observer field size is defined with a second viewing angle, the first and the second viewing angle being different.

Thus, within the scope of the invention, a precise or at least two-stage sorting method of test light-emitting diodes is proposed. Optionally, further sorting stages, in particular at least one nth sorting stage, for example upstream, can be interposed and / or connected downstream, which comprises a pre-selection, intermediate selection or subsequent selection of the test light-emitting diodes. In the at least one n-th sorting stage, the test light-emitting diodes are arranged, which are arranged in a common n-th area of an n-th color locus, wherein the n-th color locus is defined in an n-th color model with an n-th observer field size.

The invention is based on the consideration that, although metameric groups of light emitting diodes could be formed with the previous binning method, the metameric light emitting diodes in a group cause the same color valence or the same color perception in an observer. However, this metameric state of the LEDs applies only under the sorting conditions in the binning method. Changing the boundary conditions for the operation of the light-emitting diodes, the color valence or the color perception can also change. In particular, it has been found that the color perception changes depending on the observer field size under which the color stimulus of the LEDs is perceived. The observer field size is understood in particular to be a viewing angle of an observer on a surface area of the light-emitting diodes. The observer field size, in particular the viewing angle under which the same surface area is perceived, may change on the one hand because of the distance between the observer and the lighting device. Thus, the observer field size or the viewing angle becomes larger when the observer comes closer to the light-emitting diodes, and smaller when the observer moves away from the light-emitting diodes. Furthermore, the observer field size and / or the viewing angle can change by changing the viewing angle at the same distance. Thus, with a frontal plan view, ie a viewing angle of 90 degrees, of the observer on the light-emitting diodes, a first viewing angle as an observer field size and an oblique top view, for example at an angle of 10 degrees, results in a narrow viewing angle and thus a different observer field size. The viewing angle and / or the observer field size may also change by a combination of distance and viewing angle.

Whereas conventional binning methods are based only on a single observer field size, it is proposed according to the invention to design the method such that at least or exactly two different observer field sizes are used and only the test light diodes are sorted into the color class, which is the same for both the first observer field size and the second observer field size are arranged sufficiently close to the first color location and / or to the second color location or the nth color location in each case with respect to their color model. The sorting method ensures that test light-emitting diodes, which are used, for example, in a common lighting device, not only appear homogenous with regard to the light color when viewed from a small distance, but also provide the same color impression at a greater distance. Thus, it is achieved that test light-emitting diodes are sorted into the color class, which are formed metamer with respect to at least two observer field sizes.

In a preferred embodiment of the invention, the test light emitting diodes are designed as monochromatic light-emitting diodes, in particular as LEDs or as OLEDs. Especially when sorting monochrome light-emitting diodes, it is advantageous to use the at least two-stage sorting method in order to obtain color homogeneous groups of light-emitting diodes for use in common lighting devices.

In a preferred embodiment of the invention, the first observer field size is designed as a 2-degree observer field and / or the second observer field size as a 10-degree observer field. These chosen observer field sizes have meanwhile become established as standard observers, so that on the one hand analytical formulas for these observer field sizes and on the other hand extensive measuring and comparison materials can be used. Physically considered by the two very different observer field sizes different areas of the human eye are considered, which lead to the largest color changes place when changing the observer field size, so that the method is particularly meaningful with the proposed observer field sizes.

In a preferred implementation of the invention, the first and / or the second color model is designed as a CIE-Lu'v 'color space system, the color words being represented with the coordinates u'- and v'-. The advantage of these color models is that the geometric distance of the color words approximately describes the distance according to the sensation of the colors of the color points. The choice of these color models thus has the advantage that the size of the areas of the color words directly have a meaningfulness. In fact, it is immediately understandable that the smaller the area around a color locus, the lower the scatter or tolerances in perceived color.

In a preferred embodiment of the invention, the first and / or the second color locus is defined by a virtual or real reference light-emitting diode. Thus, on the one hand, a physically existing reference light-emitting diode can be used to define the first and / or the second color locus. Alternatively, a corresponding first and / or second color location can also be created only computer-aided or virtually.

The test light-emitting diodes in the intermediate class are particularly preferably configured metamerically to the reference light-emitting diode or to the virtually created color locus of the reference light-emitting diode in the first color model having the first observer field size. The second range, on the other hand, is preferably determined by a metamerism index for observer field size dependence (MiB) between the test light diodes to be tested and the reference light-emitting diode. The metamerism index for observer field size dependence (MIB) defines in particular a measure of how well two different light-emitting diodes are able to provide the same color impression, the same color valence and / or the same color perception, although the observer field size, in particular the viewing angle, is on changes a defined surface area of the LEDs.

In a first possible embodiment of the invention, the color hues of the test light-emitting diodes and / or the metamerism index (MIB) are detected experimentally, in particular by measurement. For example, by using a color sensor, the color location of the test light-emitting diodes in the first color model can be determined and compared with the first color location. In a further development, the color locus of the test light diodes in the second color model with the second observer field size can be determined with one or the color sensor and compared with the second color locus. Depending on a definition of possible deviations of the measured color locus from the first or second color locus as an area, sorting can be implemented.

In another embodiment of the invention, in a first reference step, the first color locus in the first color model is determined from the emission spectrum of the reference light-emitting diode via a first spectral value function set for the first color model having the first observer field size.

Such a spectral value function set, especially for a 2-degree observer field size, is disclosed, for example, in the following reference:
CIE 1931: Colorimetry, Resolutions 1-4. In: Recueil des travaux et compte rendu des séances, Hutième Session Cambridge, The National Physical Laboratory Teddington, Cambridge at the University Press, 1931, pp. 19-29.

A similar spectral value function set can also be derived from recommendation CIE 170-1: 2006 of the CIE.

Alternatively, in the first reference step, the first color location is defined.

In a first intermediate step, the color location in the first color model is determined from the respective emission spectrum of the test light diodes via one or the first spectral value function set for the first color model with the first observer field size for the test light diodes.

The test as to whether the color words lie in the region of the first color locus according to the first-mentioned step can be performed by comparing the measured color-words with the measured or defined first color-locus. For example, the area may be defined by a color locus spacing in the first color model. Thus, only the test light-emitting diodes are sorted into the intermediate class, which lie with their color locus within the range of the first color locus and metamer to the reference light-emitting diode in the sense of this definition.

In a second reference step, the second color locus in the second color model is determined from the emission spectrum of the reference light-emitting diode via a second spectral value function set for the second color model with the second observer field size.

Such a spectral value function, especially for a 10 degree observer field size, is disclosed, for example, in the following reference:
CIE 1964: Official Recommendations, Committee E-1.3.1. - color measurement. In: 15th Annual General Meeting in Vienna, CIE Publication 11A, 1963, p. 37.

A similar spectral value function set can also be derived from recommendation CIE 170-1: 2006 of the CIE.

Alternatively, in the second reference step, the second color location is defined.

In a second intermediate step, the respective color location in the second color model is determined from the respective emission spectrum of the test light diodes from the intermediate class via one or the second spectral value function set for the second color model with the second observer field size for the test light diodes.

The test as to whether the color words lie in the region of the second color locus according to the subsequent step can be carried out by comparing the measured color words with the measured or defined second color locus. For example, the range may be defined by a distance between the second color location and the test locations of the test light-emitting diodes in the second color model for each test light-emitting diode. In the case where only metameric test LEDs were sorted into the intermediate class in the step and that only intermediate class test LEDs were used in the second intermediate step, the color locus spacing between the color locus of the test LEDs determined with respect to the second color model and that in the second Reference step determined or predefined second color location for the second color model, the metamerism index for observer field size dependence (MiB).

The method described in the claims can be carried out in the order shown, but it is also possible that process steps are changed or summarized in chronological order. In particular, it is possible that first all reference steps are performed. Alternatively or additionally, it is possible for the intermediate steps to be applied to all test light-emitting diodes, and the sorting takes place only subsequently.

In an alternative embodiment of the invention, metamere test light diodes are first sorted into the intermediate class in the step. To determine the metamerism index for observer field size dependence (MiB), a difference spectrum is used for each of the test LEDs in the intermediate class the spectral change sensitivity function set defines a measure of how the differences between the emission spectra in the difference spectrum contribute to the metamerism index.

X, Y, Z

Farbwerte im zweiten Farbsystem

u'

Farbkomponente in dem zweiten Farbmodell

mit: u' = 4X / X+15Y+3Z und mit dem Ansatz:

The change sensitivity function set can be constructed as follows: The basic idea is to investigate how changes in the spectral values X, Y, Z affect the u 'component or v' component in the second color model. In mathematical terms, this is the following partial derivative: Δu '= ∂u' / ∂X · Δx + ∂u '/ ∂YΔY + ∂u' / ∂Z · ΔZ With:

X, Y, Z

Color values in the second color system

u '

Color component in the second color model

With: u '= 4X / X + 15Y + 3Z and with the approach:

Thus, from the above partial derivative:

Thus, the change sensitivity function for the u 'component results in:

The change sensitivity function for the v 'component can be calculated analogously, with both change sensitivity functions forming the change sensitivity function set.

mit:

S_diff(λ)

Differenzspektrum

Δu'_empf

Änderungsempfindlichkeitsfunktion für die u'-Komponente

Δv'_empf

Änderungsempfindlichkeitsfunktion für die v'-Komponente

Δu'_{MIB(Farbmodell1|Farbmodell2)}

u'-Komponente des Farbortabstands in dem zweiten Farbmodell

Δv'_{MIB(Farbmodell1|Farbmodell2)}

v'-Komponente des Farbortabstands in dem zweiten Farbmodell

Δu'v'_{MIB(Farbmodell1|Farbmodell2)}

Farbortabstand in dem zweiten Farbmodel/Metamerie-Index für Beobachterfeldgrößen-abhängigkeit (MIB)

Based on the change sensitivity function set and the difference spectrum, the color location distance and thus the metamerism index can be determined as follows:

With:

S _diff (λ)

difference spectrum

Δu ' _rec

Change sensitivity function for the u 'component

Δv ' _rec

Change sensitivity function for the v'-component

Δu ' _{MIB (color} model1 _{| color} model2 ₎

u 'component of the color locus spacing in the second color model

Δv ' _{MIB (color model1 | color model2)}

v 'component of the color locus spacing in the second color model

Δu'v ' _{MIB (color} model1 _{| color} model2 ₎

Color Space Spacing in Second Color Model / Metamerism Index for Observer Field Size Dependence (MIB)

As already mentioned at the beginning, the method can have at least one further step, wherein z. For example, in a subsequent step, a third-order fine-order set is sorted into a third-order color order from the fine-selection set of the test light-emitting diodes, the color spaces of the third order color-matching test light-emitting diodes being arranged in a common region of a third color locus, the third color locus in a third color model is set with a third observer field size, wherein the first, the second and the third observer field size are formed differently. Instead of a subsequent further step, an upstream step for pre-sorting can be provided in the same way.

Further features, advantages and effects of the invention will become apparent from the following description of a preferred embodiment of the invention and the accompanying figures. Showing:

1a an illumination system consisting of or comprising two light emitting diodes with two associated emission spectra;

1b a schematic representation for explaining the change of the observer field size when changing an observation distance;

1c a schematic representation for describing the change of the observer field size when changing a viewing angle;

2 a flow chart illustrating an embodiment of the invention;

3 another flowchart illustrating another embodiment of the invention.

The 1a shows a highly schematic representation of a first and a second light-emitting diode 1a , B, together if necessary with other light emitting diodes form a surface lighting system as a lighting device. The surface lighting system is used for example as aircraft lighting for the interior.

Right next to it are for the first light emitting diode 1a and for the second LED 1b in each case the emission spectrum ES1 or ES2 shown. Both LEDs 1a , b are formed as white LEDs, but have different emission spectra ES1 and ES2. Such differences can occur with identical LEDs by manufacturing tolerances. Alternatively, it is possible that the light emitting diodes 1a , b different in design. In the graph, the intensity or luminance is normalized to 1 normalized over the wavelength lambda.

In principle, it is attempted that in a lighting device only light-emitting diodes are used, which are metamer to each other, that is, the same color perception or the same Cause color valence in an observer. However, it has been found that the color perception or the color valency changes among other things as the observer field size changes in an observer. Thus, LEDs can 1a , B are metamerically formed at a first observer field size to each other, but differ in the Farbvalenz or color perception at another observer field size. Thus, the metameric state applies only to the conditions of the first observer field size, in other observer field sizes, the color similarity of the illumination devices deteriorates 1a , b. A change in the observer field size may occur during operation of the light-emitting diodes 1a , b result in a change of the observation distance, as shown in the 1b is shown.

In the 1b an observer B is visualized, which in two different observation distances to the light-emitting diodes 1a , b is arranged and on the light-emitting diodes 1a , b looks. At a greater distance results in a first observer field size BFG1, which occupies a total angle of 2 degrees as a viewing angle in this example. At a smaller distance results in a second observer field size BFG2, which occupies a total angle of 10 degrees as a viewing angle in this example. According to the 1c Different observer field sizes BFG 1/2 can also result from different viewing angles. So arises in the example in the 1c the second observer field size BFG2, when the observer B is perpendicular, that is, with a viewing angle of 90 degrees, to the illumination device 1a b looks at and the first observation field size BFG1 when the observer B with a viewing angle of about 10 degrees to the illumination device 1a , b looks.

To describe the perceived color of the LEDs 1a, b Color models are used in which color schemes for the color of the LEDs 1a , b can be entered. A typical color model is the Lu'v 'color model according to CIE. However, there are several such color models, wherein the color models differ in the conditions in the observer field size. Thus, the definition of a color locus also includes the indication of the underlying color model with the observer field size and the associated spectral value function set.

When changing the viewing angle and thus the observer field size, as in the 1b and 1c The underlying color model also changes.

The 2 shows a highly schematic flowchart for an embodiment of the inventive method for sorting the LEDs 1a , b as test light-emitting diodes. Starting from a basic quantity GM of test light diodes, which are to be sorted, in a first step 100 determines the color spaces of the test light-emitting diodes with respect to a first color model having a first observer field size, wherein the color locus is determined by a first spectral value function set. Subsequently, all test light diodes are sorted into an intermediate class ZK whose color locus lie in a common first region of a first color locus with respect to the first color model having the first observer field size. In this intermediate class ZK, a coarse selection set GAM is thus sorted as a subset of the basic quantity GM of the test light-emitting diodes. The first color locus, which is defined with respect to the first color model having the first observer field size and the first spectral value function set, may for example also be predetermined.

In a subsequent step 200 starting from the coarse-selection quantity GAM, all the test light-emitting diodes are sorted into a color class FK having a color location with respect to a second color model having a second observer field size and a second spectral value function set arranged in a second area of the second color location. The second color locus is fixed with respect to the second color model with the second observer field size and the second spectral value function set. The test light-emitting diodes, which are sorted into the color class FK, form a fine-selection set FAM, which forms a subset of the coarse-selection set GAM.

Thus, a sorting method is shown, which arranges the test light emitting diodes in two levels in the color class FK, wherein in each stage, the color location of the respective test light emitting diode is checked with respect to a color location of a first color model or second color model.

It is possible that the test light-emitting diodes are checked and sorted one after the other as described. However, it is also possible for all test light-emitting diodes from the basic quantity GM to be checked for their color locus in the first and the second color model, and subsequently the test light-emitting diodes to be sorted into the color class FK, which is in both the first region and the first color locus in the first color model as well as lie in the second area to the second color location in the second color model with their respective color location. The 3 shows a variation of the method 2 , wherein in a first reference step 50 with respect to a reference luminance diode in the first color model having the first observer field size and the first spectral value function set, the first color locus is determined as a reference color locus.

In the following first intermediate step 75 is determined from the emission spectrum of the test light diodes over the first spectral value function set for the first color model with the first observer field size of the respective color location of the test light emitting diode in the first color location.

In the step 100 Then, as before, the test light-emitting diodes are sorted into the coarse selection quantity GAM, whose color coordinates are arranged within a predefinable first area around the first color location as the reference color location of the reference light-emitting diodes.

In a second reference step 150 is determined from the emission spectrum of the reference light emitting diode via a second spectral value function set for the second color model with the second observer field size of the second color locus in the second color model as the second Referenzfarbort.

In the second intermediate step 175 From the emission spectra of the test light diodes over the second spectral value function set for the second color model with the second observer field size, the color words in the second color model for the test light diodes are determined.

In the step 200 then the test light emitting diodes are sorted into the color class FK, the color words are arranged within the second area around the second color location for the second color model.

Also in the embodiment of the method according to the 3 For example, the reference steps can be carried out in advance or even replaced by virtual values, that is to say target values which, for example, have not been determined metrologically but have only been predetermined. It is also possible that first and second intermediate step 75 . 175 be carried out for each test light emitting diode and subsequently in the sorting steps 100 . 200 the sorts are done.

In a further embodiment, it is possible, for example, that in the step 100 all test light emitting diodes are incorporated into the coarse selection quantity GAM, which according to a predefinable definition are metamer to each other and in the step 200 all test light diodes in the color class FK whose metamerism index for observer field size dependency (MiB) is smaller than a predefinable value are adopted.

The metamerism index for observer field size dependency (MiB) can be determined, on the one hand, by the spacing of the color words of the reference luminous diode and of the test luminous diodes from the coarse selection quantity GAM. Alternatively, the observer field size dependency (MiB) metamerism index may also be determined via a change sensitivity function set, as set forth above. In this alternative, the change sensitivity function set is determined as a function of the reference light-emitting diode and its second color location in the second color model. The difference spectrum S _diff (λ) results from the emission spectrum of the reference light-emitting diode and the emission spectrum of the test light-emitting diode from the coarse selection quantity GAM.

LIST OF REFERENCE NUMBERS

1a, b

LEDs

B

observer

W1 / W2

Single spectrum

BFG1

first observer field size

BFG2

second observer field size

GM

basic quantity

FAM

Fine selection set

FK

color class

GAM

Rough selection set

Claims (10)

Method for sorting test light-emitting diodes ( 1a , b) in a color class (FK), whereby in one step ( 100 ) from a basic quantity (GM) of the test light-emitting diodes ( 1a b) a coarse selection set (GAM) is sorted into an intermediate class (ZK), the color spaces of the test light-emitting diodes ( 1a b) of the intermediate class (ZK) are arranged in a common first region of a first color locus, wherein the first color locus in a first color model with a first observer field size (BFG1), whereby in a subsequent step ( 200 ) from the coarse selection quantity (GAM) of the test light-emitting diodes ( 1a b) a fine-selection quantity (FAM) is sorted into the color class (FK), the color spaces of the test light-emitting diodes ( 1a , b) the color class are arranged in a common second area of a second color locus, wherein the second color locus is set in a second color model having a second observer field size, the first and second observer field sizes being different. Method according to Claim 1, characterized in that the test light-emitting diodes ( 1a , b) are formed as single-color LEDs or OLEDs. A method according to claim 1 or 2, characterized in that the first observer field size (BFG1) is designed as a 2 ° observer field and / or the second observer field size (BFG2) as a 10 ° observer field. Method according to one of the preceding claims, characterized in that the first and / or the second color model is designed as a Lu'v 'color model according to CIE. Method according to one of the preceding claims, characterized in that the first and / or the second color locus is defined by a virtual or real reference light-emitting diode, wherein the test light-emitting diodes ( 1a b) in the intermediate class (ZK) metamer to the reference light emitting diode in the first color model are formed with the first observer field size and the second range by a metamerism index for observer field size dependence (MIB) between the test light emitting diode to be tested ( 1a , b) and the reference light-emitting diode is fixed. Method according to one of claims 1 to 4, characterized in that the chromatic colors of the test light-emitting diodes are supported experimentally, in particular by metrology. A method according to claim 5, characterized in that the chromaticity of the test light emitting diodes and / or the metamerism index for observer field size dependence (MIB) experimentally, in particular supported by metrology, are detected. Method according to one of the preceding claims, characterized in that in a first reference step ( 50 ) is determined from the emission spectrum of one or the reference light emitting diode via a first spectral value function set for the first color model with the first observer field size (BFG1) of the first color locus in the first color model that in a first intermediate step ( 75 ) from the emission spectra of the test light diodes via one or the first spectral value function set for the first color model with the first observer field size (BFG1), the color words in the first color model are determined that in a second reference step ( 150 ) is determined from the emission spectrum of the reference luminous diode via a second spectral value function set for the second color model with the second observer field size (BFG2) of the second color locus in the second color model that in a second intermediate step ( 175 ) from the emission spectra of the test light diodes via one or the second spectral value function set for the second color model with the second observer field size (BFG2), the color words in the second color model are determined, wherein the distance between the second color locus and the color names of the test light diodes in the second color model for each Test Light diode defines a color locus spacing that forms the or a Metamerism Index Observer Field Size Index (MIB) index. Method according to one of the preceding claims 1 to 7, characterized in that a difference spectrum (Sdiff) for the two emission spectra (ES1, ES2) is determined by one of the test light emitting diodes and the reference light emitting diode and is evaluated via a change sensitivity function set, wherein the change sensitivity function set defines a measure how the differences in the emission spectra (ES1, ES2) in the difference spectrum (Sdiff) contribute to the observer field size dependence (MIB) metamerism index. Method according to one of the preceding claims, characterized in that the method comprises at least one subsequent step, wherein in a subsequent step from the fine selection quantity (FAM) of the test light diodes ( 1a , b) sorting a fine selection set of the 3rd order into a 3rd order color class, the color words of the 3rd order color class test light emitting diodes being arranged in a common region of a third color locus, the third color locus being in a third color model having a third color locus third observer field size is determined, wherein the first, the second and the third observer field sizes are formed differently.

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