You are using an outdated browser. For a faster, safer browsing experience, upgrade for free today.

Light pulsation coefficient in workplaces with visual means of displaying information and ways of its normalization

ISSN 2223-6775 Український журнал з проблем медицини праці Том.19, №4, 2023


https://doi.org/10.33573/ujoh2023.04.285

Light pulsation coefficient in workplaces with visual means of displaying information and ways of its normalization

Nazarenko V.I.1, Glyva V.A.2, Kornienko S.Yu.3, Myshchenko I.4, Burdeina N.B.3, Cherednichenko I.M.1, Leonov Yu.I.1, Gorodetska L.P.1
1State Institution "Kundiiev Institute of Occupational Health of the National Academy of Medical Sciences of Ukraine", Kyiv
2Civil Assosiation «Evo.House», Lubny, Poltava region
3Kyiv National University of Construction and Architecture, Kyiv
4Accredited Laboratory of Occupational Health and Safety, Wroclaw University of Science and Technology, Wroclaw, Poland


Full article (PDF): ENG

Introduction. This paper investigates the pulsation coefficient (CP) of lighting in the work environments of office personnel utilizing Visual Information Display Devices (VIDD) and explores methods to bring it within normative parameters.

Research materials and methods. Employing a range of measurement tools including a digital photometer "TES 0693" (Ukraine), light pulsation device ЛH05 (Ukraine), Radex Lupin Luxmeter (China), and a SEKONIC C-7000 SpectroMaster spectrum meter (Japan), lighting (lux), brightness (cd/m2), and light pulsation coefficients (%) from VIDD screens were assessed. The functional state of workers with acute respiratory infections was evaluated using the seven-point fatigue scale according to Samn-Perelli (SPS). The study involved 21 employees (9 men and 12 women) aged 27–35 with 5–12 years of experience at Naftogaz CT LLC. Statistical data processing was carried out using standard Microsoft Office Excel 2003 programs (S/N 74017-640-0000106-57409).

The objective was to examine the pulsation coefficient of lighting in workplaces where office workers engage with VIDD and propose methods to align it with normative values.

Research results and their discussion. The pulsation coefficient of VIDD screen illumination during its operation depends on the screen matrix type and VIDD model. Notably, 87.5% of video monitors used in contemporary office settings exhibit relatively high pulsation coefficients of the light flux (47.8±5.14%), necessitating preventive measures. Even LED screens of Samsung Galaxy J5 and Honor smartphones, with slightly lower CP (16-19%), fail to meet regulatory values (< 15%) for light environment pulsation coefficients.

Conclusions. Optimizing brightness and contrast settings on video monitor screens can effectively reduce the pulsation coefficient of illumination in personal computer workplaces to physiologically acceptable levels. Specifically, at brightness levels set to 100% of the maximum and contrast ranging from 20% to 60%, the pulsation coefficient of VIDD screens falls below 15%. Individuals working under such settings exhibit significantly lower fatigue levels at the end of the workday compared to those exposed to pulsation coefficients exceeding 15% (tP=2.72) according to the Samn-Perelli test.

Keywords: coefficient of pulsation of the light environment, workplaces, office workers, visual means of displaying information.

References

  1. Bangor AW. Display Technology and Ambient Illumination Influences on Visual Fatigue at VDT Workstations [dissertation Ph.D on the internet]. Blacksburg, Virginia 139; 2000. Available from: https://vtechworks.lib.vt.edu/bitstream/handle/10919/26376/vfatigue.pdf.
  2. Nazarenko VI, Cherednichenko IM, Sokurenko SA, Tihonova NS, Martirosova VG, Nykyforuk OI, Kornev OM, Paliychuk SP. The age features of visual fatigue in employees of modern offices working with led visual displays and prevention measures. Ukrainian Journal of Occupational Health. 2021;17(3):189-97. DOI: https://doi.org/10.33573/ujoh2021.03.189.
  3. Nazarenko VI, Martirosova VG, Cherednichenko IM, Tikhonova NS, Beseda OY. Combined effect of lighting and high air temperature on human visual performance. Ukrainian Journal of Occupational Health. 2019;15(2):102-9. DOI: https://doi.org/10.33573/ujoh2019.02.102
  4. Sun Yu, Liu X, Qu W, Cao G, Zou N. Analysis of daylight glare and optimal lighting design for comfortable office lighting. Optik. 2020;206:164291. DOI: https://doi.org/10.1016/j.ijleo.2020.164291.
  5. Verkhovna Rada of Ukraine. [Energy strategy of Ukraine for the period until 2030]. Order of the Cabinet of Ministers of Ukraine of July 24, 2013 No. 1071. [Internet].. Available from: http://zakon3.rada.gov.ua/laws/show/n0002120-13/paran3#n3.Ukrainian.
  6. Ilyanok VA, Samsonova VG. [The influence of pulsating light sources on the electrical activity of the human brain]. Lighting technology. 1963;(5):1-5. Russian.
  7. Petrukhin VA, Chernousov PS, Dmytryenko SS, Pikurin AO. [Comparative analysis of the pulsation of the light flux of modern light sources]. Herald of science and education. 2019.(12 Pt1):18-23.Russian.
  8. Mamaev S. [The problem of pulsations in modern illumination]. Lumen & Expertunion. 2013;3(6):101-8. Russian.
  9. Tarasenko MG, Kozak KM, Koval VP. [Dynamics of the pulsation coefficient of the light flux of thermal and fluorescent light sources]. Lighting engineering and power engineering. 2015;(1):37-43. Ukrainian.
  10. Clark T. Flicker in LED Luminaires [Internet]. Finelite Inc; 2013. Available from: http://www.finelite.com/download_files/white-paper/FL_Fli-cker_In_LED_Luminaires_WhitePaper.pdf.
  11. Wilkins AJ, Veitch JA, Lehman B. LED lighting flicker and potential health concerns: IEEE standard PAR1789 update. In: 2010 IEEE Energy Conversion Congress and Exposition 12-16 Sept 2010. Atlanta: IEEE; 2010. DOI: http://doi.org/10.1109/ECCE.2010.5618050.
  12. Yarygin AV, Nazarenko VI, Semashko PV, Cherednichenko IM. [Study of parameters of light characteristics of LED video screens of dynamic advertising equipment as factors affecting the human visual analyzer]. ENVIRONMENT & HEALTH. 2023;(2):73-9. DOI: https://doi.org/10.32402/dovkil2023.02.073. Ukrainian.
  13. DBN V.2.5-28:2018. [Natural and artificial lighting. Approved: Order of the Ministry of Regional Development, Construction and Housing and Communal Affairs of Ukraine dated 03.10.2018 No. 264 On the approval of DBN V.2.5-28:2018. Natural and lamplight]. Ukrainian.
  14. DSTU EN 12464-1:2016. [Light and lighting. Workplace lighting. Part 1. Indoor workplaces (EN 12464-1:2011, IDT)]. Available from: http://online.budstandart.com/ua/catalog/doc-page.html?id_doc=71838. Ukrainian.
  15. Bondarevskyi SL, Danileyko OK, Rozhnenko ZhG. [Experimental study of the pulsation coefficient of light flux of artificial lighting sources. Electrical engineering and industrial electronics]. Technology audit and production reserves. 2016;(5/1)45-50. DOI: https://doi.org/10.15587/2312-8372.2016.79727. Ukrainian.
  16. DSanPiN 3.3.2.007-98. [State sanitary rules and norms for working with visual display terminals of electronic computing machines (Dec 10, 1998; No. 7)]. Available from: https://zakon.rada.gov.ua/rada/show/v0007282-98#Text. Ukrainian.
  17. ICAO, IATA, IFALPA. Measuring Fatigue. Asia-Pacific FRMS Seminar. Bangkok; 2012. 22 p.