Workplace Lighting Research Articles

Pengaruh Pencahayaan terhadap Kinerja Karyawan di Kantor Swarna Hutama Loka Asia, Bali

Title: The Lighting Effect on Employee Performance in the Swarna Hutama Loka Asia, Bali Office Lighting is one of the essential aspects to support daily human activities. The result of the reflection of light onto an object allows us to see clearly and comfortably so that the work can be done correctly. A good workspace should fulfill the comfortability aspects of its users. One of them is visual comfort, which affects worker performance and productivity. Optimal employee performance and productivity can be achieved if the comfort points in the workspace comply with standards, i.e., the lighting design provisions for the workspace layout and the required light intensity. The research method used in this study is a comparative method with a combined methods approach, namely by comparing the results of qualitative (respondents' questionnaire) and quantitative (measurement of light intensity and Window Wall Ratio) methods according to SNI 03-6575-2001 standards: Procedures for designing artificial lighting systems in buildings. This method is used to analyze the lighting and visual comfort of the room and its relation to the productivity of Swarna Hutama Loka (SHL) Asia’s office users. Generally, if employees feel comfortable with the workplace's lighting intensity, their performance and productivity will also increase. However, it does not always work in some conditions due to factors other than lighting, such as furniture arrangement and environmental adaptation, which are not included in this research.

A practical framework to develop and prioritize safety interventions to improve underground coal miners' safety performance.

Improvement of workers' safety performance is an integral and essential part of safety management. Relevant safety interventions to improve workers' safety performance are generally difficult to establish when there is a wide range of occupational hazards and at-risk individuals' features. This study aimed at formulating a practical approach to develop and prioritize potential safety interventions based on occupational and individual risk factors perceived by workers to promote workers' safety performance. A simple framework developed to identify and prioritize the suitable safety interventions. This framework made use of data collected using standardized and validated questionnaire and domain experts' opinions. Pearson correlation coefficients, exploratory factor analysis, and multiple linear regression were used to identify significant risk factors associated with workers' safety performance. Data were collected by interviewing 202 coal mine workers with occupational injuries, and their immediate supervisors from three mines. Safety performance was associated with the occupational factor-domain (poor working condition, poor safety environment, poor job satisfaction, and high job stress) only (regression coefficient = 2.14, p < 0.01). The following interventions were identified and prioritized to promote workers' safety performance: provide fair compensation to workers, job-specific and safety training, promotion policy, achievable targets, relevant perks/benefits, safety training awareness, workplace lighting, ventilation network, sensitize the management, associate safety performance to promotion, and develop team spirit. Our approach helps to identify and prioritize the most relevant interventions to promote safety at work when there are multiple risk factors.

Mismatched Refractive Index Strategy for Fabricating Laser-Driven Wood Diffusers from Bulk Wood for Illumination Applications.

Laser-diode-based solid-state lighting is primarily used in state-of-the-art illumination systems. However, these systems rely on light-converting inorganic phosphors, which have low quantum efficiencies and complex manufacturing conditions. In this study, a mismatched refractive index strategy is proposed to directly convert natural bulk wood into a laser-driven wood diffuser using a simple delignification and polymer infiltration method. The resulting material has the potential to be used in laser-driven diffuse illumination applications. The optical performance of the laser-driven wood diffuser is optimized by changing the density of natural wood. The optimal coefficient of illuminance variation of the wood diffuser is as low as 17.7%, which is significantly lower than that of commercial diffusers. The illuminance uniformity is larger than 0.9, which is significantly higher than the ISO requirements for indoor workplace lighting. The laser damage threshold is 7.9Jcm-2, which is considerably higher than those of the substrates of commercially available phosphors. Furthermore, the optimized wood diffuser exhibits outstanding mechanical properties, excellent thermal stability, tolerance to harsh environmental conditions, and low speckle contrast. These results show that the laser-driven wood diffuser is a promising laser-color converter that is suitable for indoor, long-distance outdoor, undersea, and other high-luminance laser lighting applications.

Effects of nature-adapted lighting solutions ("Virtual Sky") on subjective and objective correlates of sleepiness, well-being, visual and cognitive performance at the workplace.

Exposure to natural daylight benefits human well-being, alertness, circadian rhythms and sleep. Many workplaces have limited or no access to daylight. Thus, we implemented a light-panel ("Virtual Sky"), which reproduced nature-adapted light scenarios. In a laboratory office environment, three lighting scenarios were presented during the day: two lighting conditions with nature-adapted spectral light distributions, one with static and one with dynamic clouds, and a standard office lighting condition. We compared the impact of the three lighting scenarios on subjective and objective measures of alertness, cognitive performance, wellbeing, visual comfort, contrast sensitivity, and cortisol levels in 18 healthy young male volunteers in a within-participant cross-over study design. We found no evidence that an 8-h lighting scenario with static or dynamic clouds during the waking day (9am-5pm) was associated with any significant effect on objective and/or subjective alertness, cognitive performance and morning cortisol concentrations compared to standard workplace lighting. However, the dynamic light scenario was accompanied with lower levels of perceived tensionafter completing cognitive tasks and less effort to concentrate compared to the static lighting scenarios. Our findings suggest that apart from smaller effects on tension and concentration effort, nature-adapted lighting conditions did not improve daytime alertness and cognitive performance in healthy well-rested young participants, as compared to standard office lighting.

Influence of lighting on visual performance.

This review emphasizes the effect of light on visual efficiency, the impact of different lighting focuses, types of lighting, and their influence on vision and productivity. Light sources and standards are intriguing subjects for ophthalmologists. Guidelines regarding the level of lighting influence on visual activities can enhance visual performance.Methods: This article was developed based on literature reviews, with a bibliographic survey conducted in databases such as PubMed, MEDLINE, Web of Science, Embase, LILACS, and SciELO. Provides recommendations for understanding information regarding the influence of lighting on visual performance. Proper workplace lighting is crucial for improving visual efficiency, safety, productivity, and worker health. Efficient workplace lighting should avoid light sources directed towards the worker's face, prevent harmful glare, be more intense in the work area, and uniform in the rest of the room. Ophthalmologists should be knowledgeable about and provide guidance on correct lighting to ensure patient comfort and satisfaction with visual correction.

Impact of workplace lighting on employee safety

Impact of workplace lighting on employee safety

Use of EEG signals, cortisol secretion, and task performance to evaluate the effects of different lighting environments on concentration level in a sustained attention task

Previous research has indicated that lighting can affect people's concentration levels and working performance. However, it is unknown whether the same effect is also achieved when the lighting source is focused on the target to be identified. Thus, the objective of this study was to apply different lighting environments to evaluate the concentration level during a sustained attention task. To this end, 60 college students were recruited as participants (33 males and 27 females), and two lighting environments (focused and general lighting environments) with two sustained attention task times (15 and 30 min, respectively) were utilized. The task performance, electroencephalogram (EEG) signal, and cortisol secretion were employed to evaluate the concentration levels of the participants during the sustained attention task. The results show that the concentration level is affected by the lighting environment, and the participants performed better on task performance and cortisol secretion were activated in the focused lighting environment with the 15 min task time. However, there were no significant differences in task performance or cortisol secretion between the focused and general lighting environments with the 30 min task time. According to the EEG results, with either the 15 or 30 min task time, the ratio of theta to beta waves in the focused lighting environment was relatively stable, which indicates that the participants could concentrate more steadily when they worked in the focused lighting environment. In conclusion, the findings of this study could be applied to cognitive-related workplace lighting design and lighting-related research in the future. Relevance to industryThis study's results on task performance, EEG, and cortisol secretion show that the participants in a focused lighting environment can concentrate more easily. These findings could serve as a reference for the lighting environment design of cognitive-related workplaces.

Visual ergonomics, performance and the mediating role of eye discomfort: a structural equation modelling approach

The purpose of this study was to model the visual ergonomic factors affecting performance in human–computer interaction. A cross-sectional study using structural equation modelling was performed with a sample of 200 participants. The measuring instruments included the office lighting survey questionnaire, performance assessment questionnaires, visual ergonomics assessment and an eye discomfort assessment. The hypothetical model evaluated workplace lighting status and visual ergonomics as precursors, performance as the output and eye discomfort as a mediator. The results showed that eye discomfort directly affected performance. Visual ergonomics also had a significant direct effect on eye discomfort. The final model suggested a significant new path between the quality of lighting and visual ergonomics. Also, the quality of lighting had an indirect effect on eye discomfort and performance, and the effect of visual ergonomics on performance was the same. Improving the lighting quality and visual ergonomics can reduce eye discomfort and increase performance.

Optimized office lighting advances melatonin phase and peripheral heat loss prior bedtime

Improving indoor lighting conditions at the workplace has the potential to support proper circadian entrainment of hormonal rhythms, sleep, and well-being. We tested the effects of optimized dynamic daylight and electric lighting on circadian phase of melatonin, cortisol and skin temperatures in office workers. We equipped one office room with an automated controller for blinds and electric lighting, optimized for dynamic lighting (= Test room), and a second room without any automated control (= Reference room). Young healthy participants (n = 34) spent five consecutive workdays in each room, where individual light exposure data, skin temperatures and saliva samples for melatonin and cortisol assessments were collected. Vertical illuminance in the Test room was 1177 ± 562 photopic lux (mean ± SD) , which was 320 lux higher than in the Reference room (p < 0.01). Melanopic equivalent daylight (D65) illuminance was 931 ± 484 melanopic lux in the Test room and 730 ± 390 melanopic lux in the Reference room (p < 0.01). Individual light exposures resulted in a 50 min earlier time of half-maximum accumulated illuminance in the Test than the Reference room (p < 0.05). The melatonin secretion onset and peripheral heat loss in the evening occurred significantly earlier with respect to habitual sleeptime in the Test compared to the Reference room (p < 0.05). Our findings suggest that optimized dynamic workplace lighting has the potential to promote earlier melatonin onset and peripheral heat loss prior bedtime, which may be beneficial for persons with a delayed circadian timing system.

НАПРЯМКИ ДОСЛІДЖЕНЬ ПО ПІДВИЩЕННЮ КОМФОРТНОСТІ СВІТЛОВОГО СЕРЕДОВИЩА

Purpose. The aim of the study was to analyse the most promising ways to use natural light in new modern construction projects and in the reconstruction of existing buildings and modern methods of designing artificial lighting and interior design using new sources, taking into account the psychophysiological condition of the human body. Methods. In order to achieve the set objectives, the current standards of lighting environment, design solutions for natural light in workplaces, were analysed and the ecological and climatic conditions of lighting on the example of Dnipro were taken into account. Existing artificial lighting systems were analysed, the impact of lighting levels was considered, as well as sources on the state of human health, ability to work and safety. Topicality. The article considers the problem of improving the safety and comfort of the lighting environment under optimal working conditions, which preserve the health of workers and create the prerequisites for maintaining a high level of efficiency. The scientific novelty lies in a comprehensive approach to evaluating the hygienic characteristics of light and colour environment, as well as the application of results for the calculation of lighting systems and recommendations for the design and interior decoration of premises for work of high visual complexity. Practical significance. The research results could be provided to ensure safety of workers in the premises, with categories of work of high, very high and highest precision. The importance of the work lies in the need to take into account the complex effect of a light-coloured environment on the state of workers. The research results proved that safe and comfortable lighting should be designed on the basis of a multifactor model that takes into account the exposure of light of different origins at a workplace with obligatory consideration of the impact on human health during work, as well as determining the energy efficiency of workplace lighting

Elaborate Size-Tuning of Silica Aerogel Building Blocks Enables Laser-Driven Lighting.

Silica aerogels with accurate building-block control are realized by adjusting the surfactant concentration during the synthesis process. The resulting silica-aerogel monolith with spherical building blocks of ≈24-40nm, together with a deliberately created hole along the incident light direction, shows an incredibly promising application in monochromatic laser-driven lighting. The resulting coefficient of illuminance variation is as low as 8.1%, significantly outperforming commercially available ground-glass diffusers (139.0%) and polymer diffusers (249.1%); the speckle contrast is lower, as well as better, than that can be recognized by the human eye (4%), and the illuminance uniformity in the range of 0.770-0.862 is much better (higher) than that indoor workplace lighting required by the International Organization for Standardization. Lighting with any color in the visible spectrum, including white, can be obtained by using three primary color lasers (450, 532, and 638nm) with different powers simultaneously as the light source. The resulting silica aerogel, which has excellent thermal stability, high laser-damage threshold, outstanding mechanical performance, and superhydrophobicity, can be further applied to long-distance and noncontact laser-driven lighting in rain or underwater without any additional encapsulation components.

EFEKTYWNOŚĆ NATURALNEGO OŚWIETLENIA BUDYNKÓW BIUROWYCH NA PRZYKŁADZIE OBIEKTU ZLOKALIZOWANEGO W POLSCE

It is important for sustainability to reduce the energy demand of both existing and planned buildings. The requirements for workspace lighting clearly define the minimum light intensity that must be provided. The aim of the study was to verify if the selected office layouts independently fulfill the requirements of the Polish Norm for lighting of workplaces without the use of artificial light sources. The analysis took into consideration standard working hours of office buildings, that is from January to December, from 8 a.m. to 4 p.m. Interpretation of the obtained data allowed to select the layouts that maintain the most stable efficiency of natural daylight.

Analysis of the Impact of Working Environment Factors on Employee’s Health and Wellbeing; Workplace Lighting Design Evaluation and Improvement

In modern society, humans spend most of their time in the indoor environment (home, work, school...). This indoor lifestyle constantly poses challenges to our physical and mental health by affecting our hormone levels and circadian rhythm. This article deals with the possible connection between human and working environment factors and the emergence of health problems in connection with work. Using statistical methods, the dependence between the six characteristics (age, length of employment, visual demand of the work task, satisfaction with lighting conditions, and shift work) and occurrence of health-related problems and discomfort (i.e., eye discomfort, headache, eye fatigue, and seasonal affective disorder symptoms) was examined. The paper also deals with the evaluation of lighting conditions in the workshop using the lighting design software DIALux evo 9.2. Using this software, two lighting variants were modeled. The first simulated variant included lighting parameters according to the currently used luminaries and the second variant contained more efficient LED luminaries.

The interindividual variability of sleep timing and circadian phase in humans is influenced by daytime and evening light conditions

Human cognitive functioning shows circadian variations throughout the day. However, individuals largely differ in their timing during the day of when they are more capable of performing specific tasks and when they prefer to sleep. These interindividual differences in preferred temporal organization of sleep and daytime activities define the chronotype. Since a late chronotype is associated with adverse mental and physical consequences, it is of vital importance to study how lighting environments affect chronotype. Here, we use a mathematical model of the human circadian pacemaker to understand how light in the built environment changes the chronotype distribution in the population. In line with experimental findings, we show that when individuals spend their days in relatively dim light conditions, this not only results in a later phase of their biological clock but also increases interindividual differences in circadian phase angle of entrainment and preferred sleep timing. Increasing daytime illuminance results in a more narrow distribution of sleep timing and circadian phase, and this effect is more pronounced for longer photoperiods. The model results demonstrate that modern lifestyle changes the chronotype distribution towards more eveningness and more extreme differences in eveningness. Such model-based predictions can be used to design guidelines for workplace lighting that help limiting circadian phase differences, and craft new lighting strategies that support human performance, health and wellbeing.

Environmental monitoring of workplace lighting using optical Internet

The article shows the need for efficient use of electric energy in order to preserve the resources and environmental health of the planet. The necessity of the modernization of existing systems control the ambient light in the area of jobs solution to the problems of ecology eyes. The method of control and adjustment of illumination of workplaces and zones where it, is necessary is offered. A control system using the optical Internet has been developed. The simulation of the system operation was carried out, the possible amounts of saving electric energy, natural resources and reducing the negative impact on the environment were determined.

HUBUNGAN ANTARA PENERANGAN DI TEMPAT KERJA DAN KARAKTERISTIK PEKERJA DENGAN KELUHAN KELELAHAN MATA PADA PENJAHIT BORDIR DI CV.X BANGIL-PASURUAN

Improper lighting that is not according the standards may result in health problems, one of which is eyestrain, a visual disturbance. Eyestrain is one result of improper lighting that is not according to standards. In addition, the characteristics of workers also play a role in the occurrence of eyestrain. The purpose of this study is to determine the relationship between the lighting in a workplace and the characteristics of workers with complaints of eyestrain in embroidery tailors at CV "X" Bangil, Pasuruan. This study is an observational study with a cross-sectional study design. The research population was all embroidery tailors in CV "X" Bangil, Pasuruan, as many as 122 workers. The research sample was taken using the Simple Random Sampling method, and 55 workers were obtained. The data were collected by measuring the workplace lighting using a luxmeter measuring instrument. The research instrument used were observation sheets and questionnaires. The data analysis was done by using the Fisher's Exact Test. The results of lighting measurements indicate that the intensity of illumination both general and local is still below the Standard Value. The poor quality of lighting is indicated by most workers who experienced glare, shadow disturbances, and improper workplace decorations. The results of the statistical test show that the p value of all variables &gt; α (0.05). There is a significant relationship between the lighting in a workplace and the characteristics of workers with eyestrain. CV "X" needs to schedule a maintenance and cleaning for lights, armatures, wall windows, floors and work desks. In addition, it is necessary to increase the intensity of lighting in the workplace.&#x0D; &#x0D; Keywords: lighting, worker characteristics, eyestrain

Measuring the energy efficiency of workplace lighting in industrial enterprises

A model for evaluating the energy efficiency of workplace lighting in industrial enterprises is proposed. The energy efficiency of workplace lighting facilities in industrial enterprises should be understood as the ratio of the power of the artificial lighting object, necessary to bring the workplace illumination to normal, to the power consumed at a given time. An approach to monitoring the energy efficiency of workplace lighting in industrial enterprises is proposed.

What is the impact of changing workplace lighting on alertness and mood of daytime workers?

What is the impact of changing workplace lighting on alertness and mood of daytime workers?

Một số yếu tố môi trường lao động trong hầm công sự tại đảo X

Soldiers working in trench environment on Island X are influenced by many adverse factors affecting their health such as: extreme microclimate conditions (high temperature, poor ventilation), high humidity, low light intensity, high noise level. In addition, soldiers may be affected by electromagnetic radiation, dust and so on. Adverse environmental conditions causing heat stress affects the health of the soldiers. However, our research results showed that during the state transitions, the obtained microclimate indexes and the noise level after the rehearsal all increased more highly than those of them before the rehearsal. WBGT index ranged from 29.5 to 31.9oC. The measured light intensity ranged from 51.05 to 480.73 lux, not meeting the workplace lighting standards. The indicators of electric field strength and dust concentration in particular, the measured values were met with the permitted workplace conditions according to the regulation in both before and after the rehearsal of state transitions.

Prevalence of Computer Vision Syndrome and Its Relationship with Ergonomic and Individual Factors in Presbyopic VDT Workers Using Progressive Addition Lenses.

This cross-sectional study estimated computer vision syndrome (CVS) prevalence and analysed its relationship with video display terminal (VDT) exposure, as well as sociodemographic, refractive, environmental, and ergonomic characteristics in 109 presbyopic VDT workers wearing progressive addition lenses (PALs). Usual spectacles were measured with a lens analyser, and subjective refraction was performed by an optometrist. CVS was measured with the CVS-Q©. VDT exposure was collected. Ergonomic evaluations were conducted in a normal working posture looking at the screen. Air temperature and relative humidity were measured (thermohygrometer), and illumination was measured (luxmeter). Descriptive analysis and differences in CVS prevalence, as a function of the explanatory variables, were performed (chi-square test). Multivariate logistic regression was used to identify factors associated with CVS (OR and 95% CI). The mean age was 54.0 ± 4.8 years, and 43.1% were women. The mean hours of VDT use at work was 6.5 ± 1.3 hours/day. The prevalence of CVS was 74.3%. CVS was significantly associated with women (OR 3.40; 95% CI, 1.12–10.33), non-neutral neck posture (OR 3.27; 95% CI, 1.03–10.41) and altered workplace lighting (OR 3.64; 95% CI, 1.22–10.81). Providing training and information to workers regarding the importance of adequate lighting and ergonomic postures during VDT use is advised to decrease CVS and increase workplace quality of life.