Article | . 2018 Vol. 36, Issue. 3
LED Colors and Worker Stress Response after a Flower Arrangement Activity

LED-IT Fusion Technology Research Center, Yeungnam University1
Department of Horticulture and Life Science, Yeungnam University2
Department of Electronic Engineering, Yeungnam University3

2018.. 435:443


We investigated the effects of different colors of light-emitting diodes (LEDs) on worker stress response, before and after a flower arrangement (FA) activity. 16 office workers performed FA under various lighting conditions: darkness, white (4,500 K), red, blue, green, magenta, cyan, and yellow; no FA was performed in the darkness condition. To identify significant differences among the different lighting conditions, heart rate (HR), blood pressure, and heart rate variability (HRV), consisting of standard deviation of the normal-normal intervals, total power, and ratio of low frequency to high frequency, were measured before and after FA. Salivary cortisol was analyzed immediately after FA. The correlations among HR, HRV, and cortisol showed that the blue and green lights positively affected stress responses and caused considerable reduction in stress. However, there was only a slightly significant difference among other lighting colors, although individual lights may impact one or more parameters. These findings show that our study can be effectively used to enhance horticultural therapy through the constructive assistance of LED lighting colors.

1. Baek CH, Kim YJ, Kim HS, Park SO (2011) The analysis of fatigueness and preference for three appearance attributes of LED light color. J Korean Inst Illum Electr Install Eng 25:18-29. doi:10.5207/JIEIE.2011.25.1.018  

2. Belkic K, Landsbergis P, Schnall P, Baker D (2004) Is job strain a major source of source of cardiovascular disease risk? Scand J Work Environ Health 30:85-128. doi:10.5271/sjweh.769  

3. Birren F (1961) Color psychology and color therapy: A factual study of the influence of color on human life. Citadel Press, Secaucus, NJ, USA  

4. Byers DC (1983) Better health with foot reflexology: The original ingham method. Ingham Publishing, Saint Petersburg, FL, USA   

5. Choi WH, Ock SM, Kim MC, Lee BC, Jeong KS, Lee SJ (2005) Effects of aerobic exercise on heart rate variability. Korean J Fam Med 26:561-566  

6. Coleman CK, Mattson RH (1995) Influences of foliage plants of human stress during thermal biofeedback training. HortTechnology 5:137-140   

7. Cooper C (1996) Stress in the workplace. Br J Hosp Med 55:559-563  

8. Doxon LE, Mattson RH, Jurish AP (1987) Human stress reduction through horticultural vocational training. HortScience 22:655-656  

9. Driskell JE, Salas E (1996) The study of stress and human performance. In JE Driskell, E Salas, eds, Stress and Human Performance. Lawrence Erlbaum Associates, Inc., Mahwah, NJ, USA, pp 1-46   

10. Gerard R (1958) Differential effects of colored lights on psychophysiological functions. PhD Diss., Univ. of California, Los Angeles, CA, USA  

11. Gi CG, Kim H, Lee JW, Kim SD, Ma SB (2009) An introduction to lighting design (in Korean). Gidari Press, Seoul, Korea  

12. Goetzel R, Jacobson B, Aldana S, Vardell K, Yee L (1998) Health care costs of worksite health promotion participants and non-participants. J Occup Environ Med 40:341-346. doi:10.1097/00043764-199804000-00008  

13. Goldstein K (1942) Some experimental observations concerning the influence of colors on the function of the organism. Am J Phys Med Rehabil 1:147-151. doi:10.1097/00002060-194206000-00002  

14. Hancock PA, Desmond P (2000) Stress, workload and fatigue. Lawrence Erlbaum Associates, Inc., Mahwah, NJ, USA  

15. Jacobs KW, Hustmyer FE (1974) Effects of four psychological primary colors on GSR, heart rate, and respiration rate. Percept Mot Skills 38:763-766. doi:10.2466/pms.1974.38.3.763  

16. Jacobs KW, Suess JF (1975) Effects of four psychological primary colors on anxiety state. Percept Mot Skills 41:207-210. doi:10.2466/ pms.1975.41.1.207  

17. Jang WJ, Hwang MG, Park SO, Lee SN, No JY, Cho HM (2009) Introduction of LED lighting technology. Ajin Press, Seoul, Korea  

18. Kim RB (2008) Effect of holistic horticultural therapy on the stress and attention concentration of juvenile delinquents. PhD Diss., Catholic University of Daegu, Gyeongsan, Korea   

19. Larsen L, Adam J, Deal B, Kweon B, Tyler E (1998) Plants in the workplace: The effects of plant density on productivity, attitudes, and perception. Environ Behav 30:261-281. doi:10.1177/001391659803000301  

20. Lewinski RJ (1938) An investigation of individual responses to chromatic illumination. J Psychol 6:155-166. doi:10.1080/00223980. 1938.9917592  

21. Lee ES (2011) The emotional response to lighting hue focusing on relaxation and attention. J Korean Soc Design Sci 25:27-39   

22. Lipowski Z (1985) Psychosomatic medicine liaison psychiatry. Plenum Medical Book Co., New York, USA. doi:10.1007/978-1-4613-2509-3  

23. Manning M, Jackson C, Fusilier M (1996) Occupational stress, social support, and the costs of health care. Acad Manage J 39:38-750. doi:10.2307/256662  

24. Matsubayashi T, Sawada Y, Ueda M (2013) Does the installation of blue lights on train platforms prevent suicide? A before-and after observational study from Japan. J Affect Disord 147:385-388. doi:10.1016/j.jad.2012.08.018  

25. MOEL (Ministry of Employment and Labor) (2005) The status of industrial accidents. MOEL, Seoul, Korea  

26. New York Times (2009) Japanese railways hope soothing lights will curb suicides. November 4  

27. NIOSH (National Institute of Occupational Safety and Health) (1999) Stress at work. NIOSH Publication No. 99-101. NIOSH, Cincinnati, OH, USA  

28. Park ES (2003) Clinical application and effects of color therapy. Korean J Fam Med 24:225-231   

29. Park HS, Lee CS, Jang JS (2011) The effect of LED lighting hues on the rating and recognition of affective stimulus. J Korean Soc Emot Sensibility 14:371-384   

30. Quick J (1998) Introduction to the measurement of stress at work. J Occup Health Psychol 3:291-293. doi:10.1037/1076-8998.3.4. 291  

31. Shoemaker CA, Randall K, Relf PD, Geller ES (1992) Relationships between plants, behavior, and attitudes in an office environment. HortTechnology 2:205-206  

32. Sun H, Sun D (1998) Colour your life. How to use the colour reflection reading for insight and healing. Judy Piatkus, Ltd., Publishers, London, UK  

33. Suya S (2008) Aoiro bouhantou no donyu haikei to zenkoku jittai chousa (Report on the introduction of blue lights). Shomei Gakkaishi 92:631-636