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Development of a comfortable light environment for performing visually intense work – a problem of hygiene in industrial lighting

ISSN 2223-6775 Ukrainian journal of occupational health Vol.18, No 1, 2022

Development of a comfortable light environment for performing visually intense work – a problem of hygiene in industrial lighting

Martirosova V.G.1, Galinsky A.D.2, Sorokin V.M.3
1SI Kundiiev Institute of Occupational Health of the NAMS of Ukraine
2Scientific-Technical Centre "AEROPLAST"
3V.E. Lashkarev Institute of Semiconductor Physics of the NAS of Ukraine

Full article (PDF), RUS

Introduction: Despite the long history of lighting regulation, the question of creation of optimal and comfortable light environment (LI) to ensure a high level of the functional state of the organism and visual system with the least fatigue remains an underdeveloped issue.

Purpose of the study. Development of a method for creation a comfortable LI, taking into account the individual needs of a person in the level of illumination.

Materials and research methods. The studies included a questionnaire survey, physiological studies in production facility and laboratory. The studies were carried out in the Azur-Air office in order to study the reaction of the organism on effects of LI, equipped with a system of general uniform illumination with neutral white LEDS at illumination level of 4000K (in accordance with current standards) and Tcv 4000K. The study involved office workers selected for participation in experiment, aged 25-32 years, with work experience from 5 to 8 years, healthy, with visual acuity of 1.0, based on therapeutic and ophthalmological examinations. Office workers performed usual production operations with complex visual tasks at their common pace of work and neuro-emotional strain dealing with the routine responsibility at workplace. 33 office employees participated in the questionnaire survey. Based on the analysis of Eysenck's questionnaires, according to psychophysiological characteristics, participants were divided into 2 groups of 8 people - extroverts and introverts. Studies in each group were carried out for 10 working days (two working weeks) using a set of physiological studies to examine the state of general and visual performance in the dynamics of the working day and working week.

Visual performance was studied in terms of function of eye contrast sensitivity using binocular Dashkevich measurer of system visibility. The general condition of the organism was recorded in terms of cardiovascular system and was assessed by heart rate.

Laboratory studies were carried out in an experimental department of the institute, equipped with separate chambers fit with general uniform lighting systems using LEDS with a color temperature of 4000K based on computer simulation of photometric parameters in the DIALux program. Lighting systems of chambers were equipped with controlled dimmable lighting devices with smooth lighting regulators.

A laboratory experiment was conducted for 4.5 hours for 2 weeks with the participation of volunteers - students of the Kyiv Polytechnic University aged 20-21 years, selected on the basis of an ophthalmological and general examination (8 out of 29 people), healthy, with a visual acuity of 1.0, prepared and trained in research methods and distributed using Eysenck's questionnaires in groups of 4 people - extroverts and introverts. Each person performed visually intense work using special test tables and they individually set levels of illumination in connection with their psycho-emotional state and individual needs for light, using smooth lighting regulators. Illumination levels set by participants were recorded throughout the entire duration of the experiment, the data recorded in protocols and processed according to programs.

Results. Conducted studies in occupational conditions with illumination of 400lx (according to norms) among extroverts established instability of the RP in terms of CCH with high amplitude of fluctuations (p<0.05), and in laboratory experiment with self-regulation of the light flux, the performance curve with reliability p<0.05 flattens with illumination established by them at the level of 600lx. Introverts have stable level of illumination at 400 lx both in occupational and laboratory conditions (p<0.05), which corresponds to the normalized level for this type of work.

Conclusions. Depending on individual adjustment to the needs of light level and taking into account different psychophysiological characteristics, the employees were divided into two groups - photoabundant and photosensitive. A lighting device has been developed based on the ability to self-regulate the level of illumination and color temperature to create a comfortable light environment to maintain the health and performance of employees and is recommended for visually intense professions.

Key words: light environment, comfort, experimental studies, physiological methods, self-regulation, lighting device.


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