Relationship Between Spectrum and Color Gamut Area of LED Light Sources

Mengxin Zhou; Daqing Zhu; Xinyi Liao

doi:10.3788/LOP57.232302

Laser & Optoelectronics Progress, Volume. 57, Issue 23, 232302(2020)

Relationship Between Spectrum and Color Gamut Area of LED Light Sources

Mengxin Zhou, Daqing Zhu^*, and Xinyi Liao

Fujian Key Laboratory of Light Propagation and Transformation, College of Information Science and Engineering, Huaqiao University, Xiamen, Fujian 361021, China

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Abstract Get PDF(in Chinese)

Figures & Tables(15)

Fig. 1. Spectral power distribution of sample sources. (a) 2800K light sources; (b) 4000K light sources; (c) 5000K light sources; (d) 6500K light sources

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Fig. 2. Change of color temperature after monochromatic light is superimposed on light sources. (a) 2800K light sources; (b) 4000K light sources; (c) 5000K light sources; (d) 6500K light sources

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Fig. 3. Change of gamut area after monochromatic light is superimposed on light sources. (a) 2800K light sources; (b) 4000K light sources; (c) 5000K light sources; (d) 6500K light sources

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Fig. 4. Spectrum tristimulus curve of CIE1931-RGB system

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Fig. 5. Color gamuts of 2800K source 3, superposition of 425nm and 630 nm monochromatic light on 2800K source 3

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Fig. 6. Color gamuts of 2800K source 3, superposition of 505nm and 590nm monochromatic light on 2800K source 3

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Fig. 7. Visual experiment

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Fig. 8. Statistical results of visual experiment

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Fig. 9. Change of gamut area of 2800K source 5 after superposition of double monochromatic light. (a) 420nm and 635nm; (b) 420nm and 660nm; (c) 435nm and 635nm; (d) 435nm and 660nm; (e) 450nm and 635nm; (f) 450nm and 660nm

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Fig. 10. Results after superposition of double monochromatic light. (a) 2800K light sources; (b) 4000K light sources; (c) 5000K light sources; (d) 6500K light sources

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Table 1. Gamut area index of sample sources

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Table 1. Gamut area index of sample sources

Colortemperature/K	Number of samplesin source 1	Number of samplesin source 2	Number of samplesin source 3	Number of samplesin source 4	Number of samplesin source 5
2800	111	114	105	80	96
4000	109	115	96	96	80
5000	105	99	116	95	84
6500	80	95	104	90	92

Table 2. Color temperature of sample sources unit: K

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Table 2. Color temperature of sample sources unit: K

Colortemperature/K	Number of samplesin source 1	Number of samplesin source 2	Number of samplesin source 3	Number of samplesin source 4	Number of samplesin source 5
2800	2780	2867	2829	2842	2796
4000	4015	4005	4002	4012	4043
5000	4969	4996	5035	5089	5002
6500	6537	6742	6524	6543	6481

Table 3. Light source parameters matched by light box
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Table 3. Light source parameters matched by light box
Parameter Source 1 Source 2 Source 3 Source 4 Source 5
λ/nm 425 630 505 590
R_f 60.4 70.5 86.3 83.3 78.2
R_g 121.4 119.6 103.5 98.1 97.8
T_c/K 2934 2339 2797 3312 2582

Table 4. Quantitative scoring of visual experiment
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Table 4. Quantitative scoring of visual experiment
Content 1 2 3 4 5 6 7
Color clarity Verycolorful Colorful Slightlycolorful Slightlycolorless Colorless Verycolorless
Colorpreference Likevery much Like Generallylike Neutral Generallydislike Dislike Dislikevery much

Table 5. Result of constant color temperature and increased color gamut after double monochromatic light superimposing

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Table 5. Result of constant color temperature and increased color gamut after double monochromatic light superimposing

Colortemperature/K	$λ_{₁}$	$λ_{₂}$	k₁	k₂	T_c	R_g	R_f	DR_f	DR_g	D_uv
2800,source 5	420	635	0.2	0.1	2771	99	80	-2.6	3	0.0052
	420	660	0.2	0.4	2749	101	80	-1.6	4	0.0055
	435	635	0.1	0.1	2772	100	81	-2.4	3	-0.0050
	435	660	0.1	0.4	2750	100	81	-1.4	4	0.0053
	450	635	0.1	0.1	2783	98	80	-2.4	2	0.0053
	450	660	0.1	0.4	2760	99	81	-1.4	3	0.0056
Colortemperature/K	$λ_{₁}$	$λ_{₂}$	k₁	k₂	T_c	R_g	R_f	DR_f	DR_g	D_uv
4000,source 3	420	635	0.3	0.1	4026	101	91	4.5	5	0.0059
	420	660	0.2	0.2	4015	99	90	3.0	3	0.0066
	435	635	0.1	0.1	3983	99	88	1.5	3	0.0042
	435	660	0.1	0.3	3974	99	86	-0.5	3	0.0044
	450	635	0.1	0.1	4007	98	88	1.5	2	0.0044
	450	660	0.1	0.3	3998	99	87	0.5	3	0.0046
5000,source 4	420	635	0.7	0.3	5130	103	69	-5.3	8	0.0049
	420	660	0.7	0.9	5104	105	69	-4.9	10	0.0054
	435	635	0.3	0.3	5059	103	72	-2.6	8	0.0033
	435	660	0.3	0.8	5084	104	72	-2.4	9	0.0031
	450	635	0.2	0.2	5130	100	73	-1.3	5	0.0004
	450	660	0.3	1.0	5075	104	74	-0.3	9	0.0046
6500,source 2	420	635	0.2	0.1	6508	98	66	-3.5	3	0.0025
	420	660	0.2	0.3	6495	99	66	-3.1	4	0.0028
	435	635	0.1	0.1	6502	98	66	-3.5	3	0.0023
	435	660	0.1	0.3	6489	99	67	-2.5	4	0.0026
	450	660	0.1	0.4	6453	100	68	-1.5	5	0.0036

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Mengxin Zhou, Daqing Zhu, Xinyi Liao. Relationship Between Spectrum and Color Gamut Area of LED Light Sources[J]. Laser & Optoelectronics Progress, 2020, 57(23): 232302

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