IMPROVED WHITE LIGHTING DEVICE FOR RETAIL ILLUMINATION

Abstract

The invention provides a lighting device (100) comprising a solid state light source (10) configured to provide blue light (11) having a dominant wavelength selected from the range of 440-490 nm, a first luminescent material (210) configured to convert part of the blue light (11) into first luminescent material light (211) having intensity in one or more of the green and yellow having a CIE u (211), and a second luminescent material (220) configured to convert part of one or more of the blue light (11) and the first luminescent material light (211) into second luminescent material light (221) having intensity in one or more of the orange and red having a CIE u (221), wherein the first luminescent material (210) and the second luminescent material (220) are selected to provide said first luminescent material light (211) and said second luminescent material light (221) defined by a maximum ratio of CIE u (211) and CIE u (221) being CIE u(221)=1.58*CIE u(211)+0.255, and a minimum ratio of CIE u (211) and CIE u (221) being CIE u(221)=2.3*CIE u(211)+0.04.

Claims

1. A lighting device comprising a solid state light source configured to provide blue light having a dominant wavelength selected from the range of 440-490 nm, a first luminescent material configured to convert part of the blue light into first luminescent material light having intensity in one or more of the green and yellow having a CIE u, and a second luminescent material configured to convert part of one or more of the blue light and the first luminescent material light into second luminescent material light having intensity in one or more of the orange and red having a CIE u, wherein the first luminescent material and the second luminescent material are selected to provide said first luminescent material light and said second luminescent material light defined by a maximum ratio of CIE u and CIE u being CIE u=1.58*CIE u+0.255, and a minimum ratio of CIE u and CIE u being CIE u=2.3*CIE u(211)+0.04, wherein the lighting device is configured to provide at a first setting of the lighting device white lighting device light having a color temperature of at maximum 3500 K.

2. The light emitting device according to claim 1, wherein the first luminescent material and the second luminescent material are selected to provide said first luminescent material light and said second luminescent material light defined by a CIE u in the range of 0.102-0.118 and a CIE u in the range of 0.38-0.415, or by a CIE u in the range of 0.14-0.158 and a CIE u in the range of 0.4-0.44.

3. The light emitting device according to claim 1, wherein the solid state light source has a LED die, wherein the lighting device comprises a light converter comprising said first luminescent material and said second luminescent material, and wherein the light converter is in physical contact with the LED die.

4. The light emitting device according to claim 1, and having a CIE v of at least 0.005 below the black body locus, and having a CIE v of at maximum 0.02 below the black body locus.

5. The light emitting device according to claim 3, wherein the lighting device is configured to provide at said first setting of the lighting device white lighting device light having a color rendering index of at least 80.

6. The light emitting device according to claim 3, wherein the lighting device is configured to provide at said first setting of the lighting device white lighting device light having a gamut area index of at least 100.

7. The light emitting device according to claim 1, wherein the solid state light source, the first luminescent material and the second luminescent material are configured to provide a spectral distribution with at least 80% of the power in the spectral region of 380-495 nm in the range of 440-480 nm, at least 80% of the power in the spectral region of 470-650 nm in the range of 485-630 nm, and at least 80% of the power in the spectral region of 570-760 nm in the range of 585-720 nm.

8. The light emitting device according to claim 1, wherein the solid state light source, the first luminescent material and the second luminescent material are configured to provide a spectral distribution with a first maximum selected from the range of 440-450 nm with a full width half maximum selected from the range of 15-30 nm, and a band comprising at least two maxima with a second maximum selected from the range of 515-545 nm and a third maximum selected from the range of 610-630 nm, wherein the band has an intensity of at least 40% of the first maximum over the wavelength range of 500-680 nm.

9. The light emitting device according to claim 1, wherein the first luminescent material comprises M.sub.3A.sub.5O.sub.12:Ce.sup.3+, wherein M is selected from the group consisting of Sc, Y, Tb, Gd, and Lu, wherein A is selected from the group consisting of Al, Ga, Sc and In, and wherein at least one or more of M comprises Lu and A comprises Ga applies.

10. The light emitting device according to claim 1, wherein the first luminescent material comprises a divalent europium comprising luminescent material selected from the group consisting of silicates, chlorosilicates, and beta-sialons.

11. The light emitting device according to claim 1, wherein the second luminescent material comprises MAlSiN.sub.3:Eu, wherein M is one or more elements selected from the group consisting of barium, strontium and calcium.

12. The light emitting device according to claim 10, wherein the second luminescent material comprises different MAlSiN.sub.3:Eu compounds, with a first compound with M at least comprising Ca and a second compound with M at least comprising Sr.

13. The light emitting device according to claim 1, wherein the solid state light source is configured to provide blue light having a dominant wavelength selected from the range of 440-470 nm, wherein the first luminescent material has a peak maximum selected from the range of 510-530 nm and a full width half maximum selected from the range of 60-80 nm, and wherein the second luminescent material comprises a first second luminescent material having a first second peak maximum selected from the range of 610-640 and a full width half maximum selected from the range of 60-110 nm and a second luminescent material having a second luminescent material peak maximum selected from the range of 630-680 nm and having a full width half maximum selected from the range of 60-130 nm, and wherein the first second peak maximum and the second peak maximum differ with at least 10 nm.

14. A lighting system comprising the light emitting device according to claim 1 and a control system configured to control the light emitting device.

15. Use of the light emitting device according to claim 1 in retail or hospitality lighting.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0084] Embodiments of the invention will now be described, by way of example only, with reference to the accompanying schematic drawings in which corresponding reference symbols indicate corresponding parts, and in which:

[0085] FIGS. 1a-1c schematically depict some aspects of the invention;

[0086] FIG. 2 shows a scatter plot of CE(max) (y-axis) versus Red saturation index (RSI)(x-axis): a plurality of light source and luminescent material combinations with the area of RedSatIdx>2 at sufficient high overall efficiency, indicated with the rectangle;

[0087] FIG. 3 shows a scatterplot of CIE u (red) (y-axis) versus CIE u (yellow/green)(x-axis): color point of both red and green/yellow phosphors that fulfill the Red saturation and efficiency requirement for the invented white light source; when the above indicated equations are complied with, the desired optical properties, including GAI may be obtained; each point indicates a combination of luminescence of a first and a second luminescent material;

[0088] FIG. 4 shows an embodiment of a suitable spectral distribution of the device light, with on the x-axis the wavelength (nm) and on the y-axis intensity (measured on energy scale (Watt));

[0089] FIG. 5: example of a general colour rendering index graphic for a test light source, which was used in the study by Jost et al. The graphic shows the changes in colorfulness and hue shifts for the eight CIE1974 test-colour samples (defined in CIE publication 13.3-1995). The dashed circle indicates a distance of unity to the origin, whereas the solid line, connecting the points for the test light source, indicates the relative increase in gamut area. The arrows in the graphic represent the change in colorfulness and hue for the eight test-colour samples, relative to the reference illuminant; and

[0090] FIG. 6 shows an embodiment of a suitable spectral distribution of the device light, with on the x-axis the wavelength (nm) and on the y-axis intensity (measured on energy scale (Watt)).

[0091] The schematic drawings are not necessarily on scale.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0092] FIG. 1a schematically depicts an embodiment of a lighting device 100 as described herein. The lighting device 100 comprises a light source 10 configured to provide blue light source light 11, a first luminescent material 210 configured to convert at least part of the light source light 11 into first luminescent material light 211 with light intensity in one or more of the green spectral region and yellow spectral region and a second luminescent material 220 configured to convert (i) at least part of the light source light 11, or (ii) at least part of the light source light 11 and at least part of the first luminescent material light 211 into second luminescent material light 221 with light intensity in the orange and/or red spectral region.

[0093] Further, the lighting device comprises a light exit face 110. Herein in the embodiment of FIG. 1a, this may be the downstream face of a window 105.

[0094] The terms upstream and downstream relate to an arrangement of items or features relative to the propagation of the light from a light generating means (here the especially the first light source), wherein relative to a first position within a beam of light from the light generating means, a second position in the beam of light closer to the light generating means is upstream, and a third position within the beam of light further away from the light generating means is downstream.

[0095] In FIG. 1b this is the downstream face of a converter 200. Here, in FIGS. 1a-1c the converter 200 comprises the first luminescent material 210 and the second luminescent material 220, e.g. a layers (FIG. 1a), or as mixture (FIGS. 1b-1c). Note that the converter 200 may also include materials and/or layers other than the first luminescent material 210 and the second luminescent material 220. In FIG. 1a, the converter is configured upstream of the light exit face, here upstream of window 105. Especially, when using separate layers of the first luminescent material 210 and the second luminescent material 220, the latter is configured downstream of the former, in order to further facilitate absorption of the first luminescent material light 211. Would the second luminescent material 220 substantially not absorb first luminescent material light 211, then the order of the layers may also be revered. Further, also mixtures may be applied (see FIGS. 1b-1c).

[0096] Further, the lighting device 100 is configured to provide lighting device light 101 downstream from said light exit face 110. Here, as shown in FIG. 1a, the lighting device light 101 comprises one or more of said light source light 11, said first luminescent material light 211, and said second luminescent material light 221. As indicated above, the second luminescent material 220 is configured to be at least partly saturated with (i) light source light 11, or (ii) light source light 11 and first luminescent material light 211.

[0097] The distance between the first and/or the second luminescent materials and the light source 10, especially the light emitting surface, is indicated with reference d1, which is (substantially) zero in the case of FIG. 1c (d1 not depicted in FIG. 1c) and which may be in the range of 0.1-50 mm, especially 1-20 mm in e.g. the embodiment of FIGS. 1a-1b. In the schematically depicted embodiment, the distance d1 is the distance between a light exit surface (or light emitting surface) 122 of a solid state light source 120, such as an LED die.

[0098] FIG. 1b schematically further depicts a control system 130, which may include a user interface 140. Hence, FIG. 1b also schematically depicts a lighting system 1000.

[0099] The lighting device 100 may especially be applied for providing white lighting device light 101.

[0100] In this invention we describe the solution of a source that has the best compromise between the three parameters. The starting point is the white light source that does not have deep blue. The color perception can be improved by increasing the color gamut to above 100 for both CRI80 and CRI90 solutions. If within the efficiency limit, the color point of the white light could be brought even slightly more below BBL than the initial color point x,y=(0.422, 0.386) (i.e.: u,v: 0.249, 0.512. Further, within efficiency limits the GAI of the premium white could be increased to enhance saturation of red.

[0101] In an embodiment, an optimal retail lighting source is described by: >105 lm/W LED efficiency in the application (DC operated at Tj=85 C. (junction temperature); a color point target below BBL x,y=(0.422, 0.386); and a GAI100.

[0102] To achieve GAI100, a phosphor emission spectrum is needed which has more pronounced spectral peaks than the mainstream phosphors used for white. Specific embodiments have a Red Saturation Index (RedSatIdx)>2 and a as high as possible CE(max) (with CE being conversion efficiency (Lm/Watt: lumen lamp/watt provided to lamp). Based on this criteria we selected the datapoints as given in FIG. 2, indicated in the box.

[0103] FIG. 3 shows a scatterplot of CIE u (red) (y-axis) versus CIE u (yellow/green)(x-axis): color point of both red and green/yellow phosphors that fulfill the GAI and efficiency requirement for the invented white light source; when the above indicated equations are complied with, the desired optical properties, including G.sub.a may be obtained. Line II reflects the equation CIE u(221)=1.58*CIE u(211)+0.255 and line I reflects the equation CIE u(221)=2.3*CIE u(211)+0.04. Within these lines, luminescent material combinations of (a) green and/or yellow and (b) orange and/or red provide the desired optical properties (in combination with the light source) of one or more of CRI, efficiency, GAI, etc.

[0104] Further, it appears that two specific sub regions provide especially good results. These sub regions are indicated with the areas IV and VI, even more especially the sub regions III and V (which latter are the smaller regions within the former regions). For first luminescent materials that are more greenish, the left regions III,IV are especially of relevance, whereas for the more yellowish first luminescent materials, the right regions V, VI are especially of relevance. Especially these regions provide relative good G.sub.a values, such as in the range of >100, up to about 115.

[0105] FIG. 4 shows an embodiment of a suitable spectral distribution of the device light 101 (also indicated with W as it is white light), with on the x-axis the wavelength (nm) and on the y-axis intensity (in W). Reference B indicates the blue spectral distribution, Y(O) indicates the spectral distribution of the yellow luminescent material (without reabsorption by the red phosphor(s)) and Y indicates the spectral distribution of the yellow/green luminescent material in the total spectral distribution of the white light W. Likewise, references R(O) and R indicate the spectral distribution of the red luminescent material and of the red luminescent material in the total spectral distribution W. Likewise, references O(O) and O indicate the spectral distribution of the orange luminescent material and of orange red luminescent material in the total spectral distribution W. Note that the orange luminescent material is also a red luminescent material, but with relative more spectral intensity also in the orange spectral part (peak wavelength in the 600-630 nm range). FIG. 4 shows a spectral distribution with a first maximum (at 2.8.10.sup.3) selected from the range of 440-450 nm with a full width half maximum selected from the range of 15-30 nm, and a band comprising at least two maxima with a second maximum selected from the range of 515-545 nm and a third maximum selected from the range of 610-630 nm, wherein the band has an intensity of at least 40% of the first maximum (i.e. at least 0.4* at 2.8.10.sup.3) over the wavelength range of 500-680 nm.

[0106] FIG. 5 shows an example of a general colour rendering index graphic for test light source, which was used in the study by Jost et al. The graphic shows the changes in colorfulness and hue shifts for the eight CIE1974 test-colour samples (defined in CIE publication 13.3-1995). The dashed circle indicates a distance of unity to the origin, whereas the solid line, connecting the points for the test light source, indicates the relative increase in gamut area. The arrows in the graphic represent the change in colorfulness and hue for the eight test-colour samples, relative to the reference illuminant.

[0107] Below, some further examples are given, with a 448 nm blue LED in combination with a narrow green phosphor (PWL) indicated in the last column) and a mixture of 2 red phosphors (SrAlSiN.sub.3:Eu (orange) and CaAlSiN.sub.3:Eu (red)), which all give the desired spectral properties (such as CRI over 90 and GAI over 100).

TABLE-US-00001 TABLE 1 combinations with narrow banded green/yellow CIE u Blue Green Orange Red pwL CRI R9 Ga CIE u (yellow) (red) (%) (%) (%) (%) green 92.5 58.7 105 0.1096 0.3956 0.127 0.335 0.479 0.060 522 92.6 59.8 105 0.1096 0.3959 0.126 0.335 0.473 0.066 522 92.8 61.1 105 0.1096 0.3962 0.126 0.334 0.467 0.073 522 93.0 62.7 105 0.1096 0.3967 0.126 0.334 0.459 0.081 522 93.3 64.7 106 0.1096 0.3973 0.125 0.333 0.449 0.093 522 93.7 67.4 106 0.1096 0.3980 0.124 0.332 0.436 0.108 522 94.1 71.2 106 0.1096 0.3991 0.123 0.331 0.418 0.128 522 94.3 73.1 107 0.1096 0.3997 0.123 0.330 0.408 0.139 522 94.5 75.3 107 0.1096 0.4004 0.122 0.330 0.397 0.151 522 94.6 78.0 107 0.1096 0.4012 0.121 0.329 0.383 0.166 522 94.1 80.6 108 0.1131 0.4037 0.122 0.329 0.342 0.207 524 94.2 83.0 108 0.1131 0.4045 0.121 0.329 0.329 0.221 524 94.2 85.8 108 0.1131 0.4055 0.120 0.328 0.315 0.237 524 94.2 89.0 109 0.1131 0.4067 0.119 0.327 0.298 0.255 524

[0108] Hence, amongst others the invention provides a light source for providing blue light, a first luminescent material for providing first luminescent material light and a second luminescent material for providing second luminescent material, which are configured to provide white lighting device light (at a first setting) having spectral distributions (Watt) in the range of 11-14%, especially 11.9-12.7% for the blue light, 31-35%, especially 32.7-33.5% for the first luminescent material light, and 52-57%, especially 53.9-55.3%, for the second luminescent material light. Even more especially, the invention provides the light source for providing blue light, the first luminescent material for providing first luminescent material light and the second luminescent material for providing second luminescent material, wherein the second luminescent material comprises a first second luminescent material for providing first second luminescent material light, and a second second luminescent material for providing second second luminescent material light, which are configured to provide white lighting device light (at a first setting) having spectral distributions (Watt) in the range of 11-14%, especially 11.9-12.7% for the blue light, 31-35%, especially 32.7-33.5% for the first luminescent material light, and 28-50%, especially 29.8-47.9% for first second luminescent material light and 5-27%, especially 6-25.5%, for the second second luminescent material light. Especially, this applies to first luminescent materials having a relatively narrow band width, such as in the range of 60-90 nm.

[0109] FIG. 4 relates to one of the combinations shown in the above table 1.

[0110] First luminescent materials that are garnet based, may provide broader spectral distribution of the first luminescent material light, such as in the range of 110-140 nm. Examples are given, with a 448 nm blue LED in combination with a broader green (yellow) and a mixture of 2 red phosphors (SrAlSiN.sub.3:Eu (orange) and CaAlSiN.sub.3:Eu (red)), which all give the desired spectral properties (such as CRI over 90 and GAI over 100).

TABLE-US-00002 TABLE 2 combinations with broad banded green/yellow CRI CIE u CIE u Green Blue Green Red Ga R9 (yellow) (red) phosphor (%) (%) Orange (%) (%) 94 103 74 0.144 0.4166 LuAG 0.118 0.415 0.146 0.320 95 104 80 0.144 0.4204 LuAG 0.116 0.413 0.111 0.360 96 105 89 0.144 0.4258 LuAG 0.114 0.410 0.064 0.412 94 104 75 0.153 0.4258 Y(Al,Ga)G 0.118 0.434 0.059 0.389 93 104 72 0.159 0.4258 Y(Al,Ga)G 0.118 0.456 0.055 0.370 93 104 72 0.159 0.4258 Y(Al,Ga)G 0.118 0.456 0.055 0.370 95 105 85 0.153 0.4339 Y(Al,Ga)G 0.114 0.426 0 0.460 94 105 80 0.158 0.4339 Y(Al,Ga)G 0.115 0.452 0 0.432 93 105 78 0.164 0.4339 Y(Al,Ga)G 0.122 0.458 0 0.421 93 106 81 0.162 0.4339 LuAG 0.119 0.459 0 0.422

[0111] Hence, amongst others the invention provides a light source for providing blue light, a first luminescent material for providing first luminescent material light and a second luminescent material for providing second luminescent material, which are configured to provide white lighting device light (at a first setting) having spectral distributions (Watt) in the range of 11-13%, especially 11.4-12.2% for the blue light, 40-47%, especially 41-45.9% for the first luminescent material light, and 41-49%, especially 42.1-47.6% for the second luminescent material light. Even more especially, the invention provides the light source for providing blue light, the first luminescent material for providing first luminescent material light and the second luminescent material for providing second luminescent material, wherein the second luminescent material comprises a first second luminescent material for providing first second luminescent material light, and a second second luminescent material for providing second second luminescent material light, which are configured to provide white lighting device light (at a first setting) having spectral distributions (Watt) in the range of 11-13%, especially 11.4-12.2% for the blue light, 40-47%, especially 41-45.9% for the first luminescent material light, and 0-16%, especially 0-14.6% for first second luminescent material light and 30-48%, especially 32-46%, for the second second luminescent material light.

[0112] Percentages of the spectral distribution (in the visible) add up to 100%.

[0113] FIG. 6 shows an embodiment of a suitable spectral distribution of the device light 101 (also indicated with W as it is white light), with on the x-axis the wavelength (nm) and on the y-axis intensity (in W). Reference B indicates the blue spectral distribution, Y(O) indicates the spectral distribution of the yellow luminescent material (without reabsorption by the red phosphor(s)) and Y indicates the spectral distribution of the yellow/green luminescent material in the total spectral distribution of the white light W. Likewise, references R(O) and R indicate the spectral distribution of the red luminescent material and of the red luminescent material in the total spectral distribution W. Likewise, references O(O) and O indicate the spectral distribution of the orange luminescent material and of orange red luminescent material in the total spectral distribution W. Note that the orange luminescent material is also a red luminescent material, but with relative more spectral intensity also in the orange spectral part (peak wavelength in the 600-630 nm range). FIG. 6 shows a spectral distribution with a first maximum (at 0.0029) selected from the range of 440-450 nm with a full width half maximum selected from the range of 15-30 nm, and a band comprising at least two maxima with a second maximum selected from the range of 510-570 nm and a third maximum selected from the range of 610-630 nm, wherein the band has an intensity of at least 40% of the first maximum (i.e. at least 0.4* at 0.0029) over the wavelength range of 500-680 nm. Note that due to reabsorption, the contribution of the first luminescent materials to the white curve W is slightly different from the original first luminescent material light spectra distribution Y(O). Further, note that the second maximum is only visible as a shoulder. Note however that the white curve, between about 480 and 780 nm consists of two contributions: the first luminescent material light and the second luminescent material light, wherein in this embodiment the latter consists also of two contributions.

[0114] FIG. 6 relates to one of the combinations shown in the above table 2.

[0115] The term substantially herein, such as in substantially all light or in substantially consists, will be understood by the person skilled in the art. The term substantially may also include embodiments with entirely, completely, all, etc. Hence, in embodiments the adjective substantially may also be removed. Where applicable, the term substantially may also relate to 90% or higher, such as 95% or higher, especially 99% or higher, even more especially 99.5% or higher, including 100%. The term comprise includes also embodiments wherein the term comprises means consists of. The term and/or especially relates to one or more of the items mentioned before and after and/or. For instance, a phrase item 1 and/or item 2 and similar phrases may relate to one or more of item 1 and item 2. The term comprising may in an embodiment refer to consisting of but may in another embodiment also refer to containing at least the defined species and optionally one or more other species.

[0116] Furthermore, the terms first, second, third and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances and that the embodiments of the invention described herein are capable of operation in other sequences than described or illustrated herein.

[0117] The devices herein are amongst others described during operation. As will be clear to the person skilled in the art, the invention is not limited to methods of operation or devices in operation.

[0118] It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. Use of the verb to comprise and its conjugations does not exclude the presence of elements or steps other than those stated in a claim. The article a or an preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the device claim enumerating several means, several of these means may be embodied by one and the same item of hardware. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

[0119] The invention further applies to a device comprising one or more of the characterizing features described in the description and/or shown in the attached drawings. The invention further pertains to a method or process comprising one or more of the characterizing features described in the description and/or shown in the attached drawings.

[0120] The various aspects discussed in this patent can be combined in order to provide additional advantages. Further, the person skilled in the art will understand that embodiments can be combined, and that also more than two embodiments can be combined. Furthermore, some of the features can form the basis for one or more divisional applications. Below, some references in relation to the gamut area index (GAI or Ga) are provided, which references are herein incorporated by reference.

REFERENCES FOR G.SUB.a

[0121] [1] American National Standards Institution, American National Standard for electric lamps-Specification for the Chromaticity of Fluorescent Lamps, ANSI C78.376-2001 [0122] [2] American National Standards Institution, American National Standard for electric lamps-Specifications for the Chromaticity of Solid State Lighting Products, ANSI C78.377: 2011. [0123] [3] CEI/IEC 60081:1997+A1:2000. Double-capped fluorescent lampsPerformance specifications. [0124] [4] IEC 62612:2013. Self-ballasted LED lamps for general lighting services with supply voltages >50VPerformance requirements. [0125] [5] IEC 62717:2014. LED modules for general lightingPerformance requirements [0126] [6] IEC 62722-2-1:2014. Luminaire performancePart 2-1: Particular requirements for LED luminaires. [0127] [7] ISO 8995:2002(E)/CIE S 008/E-2001, Lighting of indoor work places [0128] [8] Commission regulation (EC) No 244/2009, Implementing Directive 2005/32/EC of the European Parliament and of the Council with regard to ecodesign requirements for non-directional household lamps. [0129] [9] Commission regulation (EC) No 245/2009. Implementing Directive 2005/32/EC of the European Parliament and of the Council with regard to ecodesign requirements for fluorescent lamps without integrated ballast, for high intensity discharge lamps, and for ballasts and luminaires able to operate such lamps, and repealing Directive 2000/55/EC of the European Parliament and of the Council. [0130] [10] Commission regulation (EU) No 347/2010. Amending Commission Regulation (EC) No 245/2009 as regards the ecodesign requirements for fluorescent lamps without integrated ballast, for high intensity discharge lamps, and for ballasts and luminaires able to operate such lamps. [0131] [11] Commission regulation (EU) No 1194/2012. Implementing Directive 2009/125/EC of the European Parliament and of the Council with regard to ecodesign requirements for directional lamps, light emitting diode lamps and related equipment. [0132] [12] ENERGY STAR. Program Requirements Product Specification for Lamps (Light Bulbs)Eligibility Criteria, Version 1.1, 2014. [0133] [13] Commission Internationale de l'Eclairage, Method of Measuring and Specifying Colour Rendering Properties of Light Sources. CIE Publication 13.3, Vienna: CIE 13.3, 1995. [0134] [14] Teunissen C, et al., final paper title under discussion, accepted for publication in Lighting Research & Technology. [0135] [15] Ohno Y, Fein M, Miller C. Vision experiment on chroma saturation for color quality preference. In: Proceedings of the 28th CIE session 2015; CIE 216:2015, Volume 1, Part 1; pp. 60-69. Manchester, United Kingdom, Jun. 28-Jul. 4, 2015.