Discomfort Glare Caused by R/G/B/W Four-Color Light Emitting Diode Sources

Huijuan Tian; Tiantian Hao; Tao Guan; Yang Hu; Minpeng Cai; Hui Zhang

doi:10.3788/LOP56.132301

Laser & Optoelectronics Progress, Volume. 56, Issue 13, 132301(2019)

Discomfort Glare Caused by R/G/B/W Four-Color Light Emitting Diode Sources

Huijuan Tian^1,3、*, Tiantian Hao^2,3, Tao Guan^1,3, Yang Hu^2,3, Minpeng Cai^1,3, and Hui Zhang^1,3

¹ Tianjin Key Laboratory of Advanced Electrical Energy Technology, School of Electrical Engineering and Automation, Tianjin Polytechnic University, Tianjin 300387, China

² School of Electronics and Information Engineering, Tianjin Polytechnic University, Tianjin 300387, China

³ Engineering Research Center of High Power Solid State Lighting Application System, Ministry of Education, Tianjin 300387, China

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Figures & Tables(13)

Fig. 1. Parameters of unified glare rating RUGR

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Fig. 2. Experimental platform. (a) Experimental photo; (b) diagram of experimental setup

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Fig. 3. Relative spectral power distributions of R/G/B/W LED modules

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Fig. 4. Principle of driving circuit for R/G/B/W LED source modules

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Fig. 5. Four-color LED source modules. (a) W-LED; (b) R-LED; (c) G-LED; (d) B-LED

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Fig. 6. Relationship between luminance and subjective evaluations of experimental results of four LED glare sources in three different background luminances. (a) W-LED; (b) R-LED; (c) G-LED; (d) B-LED

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Fig. 7. Relationship between luminance and subjective evaluations of experimental results of four LED glare sources after linear interpolation in three different background luminances. (a) Lb=45.833 cd·m-2; (b) Lb=19.967 cd·m-2; (c) Lb=11.750 cd·m-2

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Fig. 8. Relationship between RUGR value and subjective evaluations of experimental results for four LED glare sources. (a) W-LED; (b) R-LED; (c) G-LED; (d) B-LED

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Table 1. Discomfort glare evaluated using RUGR
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Table 1. Discomfort glare evaluated using RUGR
R_UGR Discomfort glare criterion
10 Imperceptible
13 Just perceptible
16 Perceptible
19 Just acceptable
22 Unacceptable
25 Just uncomfortable
28 Uncomfortable
31 Just intolerable
34 Intolerable

Table 2. Parameters of R/G/B/W LED modules in experiment
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Table 2. Parameters of R/G/B/W LED modules in experiment
LED x y Luminous flux /lm Power /W
W-LED 0.304 0.312 407.160 4.356
R-LED 0.686 0.314 209.060 4.157
G-LED 0.169 0.687 224.780 5.445
B-LED 0.151 0.031 53.062 3.710

Table 3. Experimental conditions
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Table 3. Experimental conditions
Item Light source
W-LED R-LED G-LED B-LED
Luminance level 10
Background luminance /(cd·m^-2) 45.833, 19.967, 11.750
Observer 10
Total number of ratings 1200

Table 4. Luminances of four LED sources at different luminance levels

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Table 4. Luminances of four LED sources at different luminance levels

Luminancelevel	W-LED /(cd·m^-2)	R-LED /(cd·m^-2)	G-LED /(cd·m^-2)	B-LED /(cd·m^-2)
1	380.760	250.720	350.220	34.268
2	823.280	514.820	739.500	72.082
3	1242.600	768.100	1115.400	108.060
4	1684.400	1026.160	1507.600	146.120
5	2100.200	1271.400	1869.000	183.680
6	2543.200	1520.400	2260.800	222.140
7	2958.600	1753.800	2628.600	258.080
8	3409.000	1985.800	3035.400	295.120
9	3852.400	2207.400	3425.400	334.460
10	4335.000	2438.000	3839.400	342.800

Table 5. Glare rating scale

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Table 5. Glare rating scale

Category	Semantic criteria	Description of reaction glare
1	Imperceptible	I am not aware of anything
2	Just perceptible	I am aware there is something but cannot tell what it is
3	Noticeable	I am aware of the presence of the luminaire but it does not bother me
4	Just uncomfortable	I am aware of a luminaire and I wish it was not there
5	Uncomfortable	I am aware of a luminaire and I would complain to my supervisor about it
6	Just intolerable	I am aware of a luminaire, and if somebody does notdo something about it, I will take direct action myself
7	Intolerable	I am aware of a luminaire and I will not stay here a moment longerif somebody does not do something about it, now

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Huijuan Tian, Tiantian Hao, Tao Guan, Yang Hu, Minpeng Cai, Hui Zhang. Discomfort Glare Caused by R/G/B/W Four-Color Light Emitting Diode Sources[J]. Laser & Optoelectronics Progress, 2019, 56(13): 132301

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