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

Abstract

Introduction. This paper investigates the pulsation coefficient (C P ) of lighting in the work environments of office personnel utilizing Visual Information Display Devices (VIDD) and explores methods to bring it within normative parameters. The aim of the research -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. Materials and methods of the research. 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/m 2 ), 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).Results. 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% (t P = 2.72) according to the Samn-Perelli test.