Evaluation methodology for light sources used to illuminate highly photosensitive artwork

Spectral energy radiated by light sources is the primary source of colour damage in highly photosensitive artworks (HPAs). However, spectral power distributions differ for different light sources, and the absorption and reflection characteristics of different materials, when irradiated by each narrow spectral energy band, also differ. This could result in large differences in the degree of radiation damage for materials under the same lighting intensity. In this paper, the suitability of different light sources used to illuminate HPAs was experimentally investigated over a long period of time by irradiating nine types of typical HPA materials with 10 different narrow-band light sources. By analysing the colour difference data of the illuminated material against the amount of exposure, a mathematical model relating the spectral composition and the damage to the colour of HPA materials was obtained. Based on this, a colour damage evaluation equation for light sources used for lighting HPAs was proposed. Finally, the equations were discussed using an example.

Lighting conditions as the occupational health related issue – case study

The paper deals with the important element of proper lighting conditions at a workplace. The case study has been focused on the intelligent building “Energis” of Kielce University of Technology, where the experimental tests took place. Several groups of volunteers filled in the questionnaires related to their subjective feelings of lighting conditions in lecture rooms at different seasons. Simultaneously, precise measurements of lighting intensity were carried out. The comparison of the expressions of the room users and the measurements enabled to draw conclusions about the conditions provided in the intelligent building related to lighting. The study provides valuable information of lighting conditions in the modern, intelligent buildings which are more and more common throughout the world and serve various purposes such as office, educational or other public utility buildings.

DESIGN FRAMEWORK FOR LIGHTING AND OCCUPATIONAL WELL-BEING IN UNDERGROUND SPACES: CASE STUDY IN PYHÄSALMI MINE

In underground spaces, lack of daylight may produce disorders in the biological clock of workers and have many negative physiological and psychological effects. Besides the traditional means of illumination, new LED lighting technologies, which allow the dynamic changes of the lighting intensity and spectral composition of white light, provide means to support workers’ daily rhythm with circadian lighting. The effects of lighting, however, are not only physiological, and there are several other factors related to lighting as a design task while the human experience of light is multifaceted. This paper illustrates the design problematics of lighting environment of underground workspaces through a case study project in Pyhäsalmi mine, Finland. The paper proposes a holistic design framework for lighting, which supports occupational well-being in underground spaces, based on the results from the case study with realized intelligent lighting pilot environment where user experiences were evaluated with semi-structural interviews.

Association Between Lighting Level to Subjective Complaints of Visual Fatigue on Operators in the Auto Welder Section

Introduction: Good intensity of light dramatically affects the eyes. If there is less intensity of light. the eye muscles contract as much as possible to see objects or vice versa. If this happens continuously, it will cause damage to the eyes. Based on the preliminary study, it was found that as the auto welder operators have the task to observe the results of the auto welder engine to determine the quality of the welder, this type of work needs accuracy so that the right lighting intensity is required. This study aimed to determine the association between the lighting level and subjective visual fatigue complaints on operators in the auto welder section. Methods: The research method used was quantitative, with a cross- sectional approach and observational method. The samples in this study were 18 respondents from the total sampling technique. The instrument used was the Visual Fatigue Index (VTI) questionnaire. Moreover, the analysis of the study results used the one sample T-test statistical test to determine the association between the dependent and independent variables. Results: The one sample T-test results showed p-value = 0.012 < α = 0.05. This result showed an association between the lighting leveland subjective visual fatigue complaints on operators in the auto welder section. Conclusion: In this research, it was found that the majority of lighting levels that did not meet the standards had an association with subjective complaints of visual fatigue on the operators in the auto welder section.Keywords: auto welder, lighting, visual fatigue

Flies Density Level in the Nutrition Installation of M. Th Djaman Sanggau Regional General Hospital

Nutrition installation at M. Th. Djaman Sanggau hospital was in charge of providing the food service needs of the patients. Nutritional installations as a place for storing, processing, serving, and distributing food, could attractted the presence of flies and pose a risk of contamination. Its location was close to the incinerator, morgue, and garbage dump. This study aimed to describe the flies density level in the Nutrition Installation of M. Th. Djaman Sanggau hospital. This research type was an observational study with a descriptive approach, which described the flies density level in the Nutrition Installation of M. Th. Djaman Sanggau hospital. Data collection was done by interview and observation. The data obtained were presented in tabular form, described, and explained in narrative form. From the study results, it was found that the flies density level in the Nutrition Installation of M. Th. Djaman Sanggau hospital was 1.13 tails per block grill with the results had met the requirements. The average measurement results for temperature figures were 28°C, humidity 75.8%, and lighting intensity 223.7 LuxIt was necessary to control the flies density level in the garbage dump container at M. Th. Djaman Sanggau hospital, by improving the sanitation and hygiene of those, spraying insecticides, and improving waste management. In addition, to reduce the density of flies in the nutrition installation of M. Th. Djaman Sanggau hospital, it was necessary to prevent access to flies by closing doors and windows, using fly barrier curtains, closing waste water disposal, and to improve sanitation hygiene

Desain Intensitas Penerangan dengan Tipe Jenis Lampu untuk Kegitan Praktikum di Laboratorium Mesin Listrik dan Pengukuran

Lighting planning in a laboratory room is one of the factors in designing to produce good and energy efficient lighting. To carry out all activities in the room of a laboratory, sufficient lighting intensity is needed, so that it can be carried out optimally, especially with regard to practicum work carried out in the laboratory for the benefit of the learning process. In terms of quality, lighting in a room is in the form of strong lighting or illumination level. The purpose of this research is to design, identify and evaluate the recommended lighting intensity / quality with the lighting standards from the existing lamp data installed in the electrical and measurement laboratory. The results of the measurement research for the Electrical Machinery and Measurement Laboratory obtained that the average light intensity for the work point of the practicum table is 127 lux, so that the light intensity is still low according to the SNI 16 - 7062 - 2004 standard with a measuring point of even lighting distribution obtained by 137 lux. If the light intensity of a laboratory is not fulfilled, it will result in inconvenience for students in carrying out the measurement practice, especially for practicum electrical circuits by calculating the value of the ring resistor. For this reason, the intensity of lighting in the laboratory room must be designed to meet the recommended lighting standards for a laboratory, namely 300 lux, namely by adding the number of 8 points of TL Philips Lifemark 36W / 54-765 lamps,or 8 points of 25 W / 2600 lumens LED lamps, or 6 Philips CLF 55 W / 3465 lumen type light point.

Evaluating the overall impression of concert lighting: An integrated approach

Using experimental data from four electric lighting scenarios at King’s College Chapel in Cambridge, we developed an integrated approach to evaluating the overall impression of concert lighting. First, we performed a group analysis based on the aggregated response from the audience, conductor and musician respondents, followed by an overall analysis accounting for all 624 responses. Ordered logistic regression analysis revealed the absence of statistically significant subjective–objective relationships for perceived visual balance, appropriateness, comfort and the overall impression. There were, however, significant results when the variables were correlated with subjective attributes. This suggests that the perceptual process was bi-level. To gain a more complete understanding of the perceived qualities, it is necessary for an approach to consider not only the intercorrelations between the subjective and objective measures, but also the intracorrelations among the subjective attributes. Further analysis of variance showed that increasing the overall lighting intensity was more likely to lead to a lower level of satisfaction. Nevertheless, providing peripheral and directional lights appeared to be the key to improving the overall impression. This paper confirms that combining detailed and generalised approaches to evaluate subjective responses can yield more meaningful interpretations, enabling relations with measures to be established with greater confidence.

Can Dental Office Lighting Intensity Conditions Influence the Accuracy of Intraoral Scanning?

The aim of this study was to evaluate the influence of different settings of ambient light intensity inside the dental office on the accuracy (trueness and precision) of an intraoral scanner (IOS). A full crown preparation was conducted on a resin molar which was scanned using a high resolution extraoral scanner to obtain a reference model. Six light settings were chosen based on the most clinically relevant light conditions inside the workspace, and the preparation was scanned using an intraoral scanner (PlanScan, Planmeca). The obtained data was analyzed using a professional 3D quality control software (Geomagic Control X). There was no statistically relevant difference between the groups when regarding trueness, although a slight influence of the light intensity could be observed on the trueness values. Regarding precision, the best results were obtained in the 3800 lux group, with the other groups presenting close values, excepting the extreme values (400 lux and 11 000 lux) groups that proved to be the most deficient.