Background and Objective: Appropriate lighting is one of the most valuable factors in optimizing physical conditions in workplaces, especially in industry, and it can increase efficiency and product quality. Therefore, this study was conducted with the aim of investigating the lighting condition and the factors affecting it in industrial workshops with less than 20 people in the northeastern region of Isfahan.
Materials and Methods: This descriptive-cross-sectional study was conducted on 500 industrial workshops with less than 20 employees in the northeastern region of Isfahan. The workshops were selected from 1000 existing workshops using a simple random sampling method. First, the initial information about the workshops and the factors affecting the intensity of lighting in workshops (e.g., cleanliness, color and reflectance of surfaces, and cleanliness of windows) were recorded. Then, the lighting was measured with a HAGNEREC1 model lux meter and the standard method mentioned in the Occupational Exposure Limits Manual, Fifth Edition. Finally, the data were analyzed using the ANOVA test, Pearson correlation coefficient, and descriptive statistics tools.
Results: The results of measuring the lighting intensity showed that 73.6% of the workshops had a desirable lighting condition. The minimum and maximum lighting intensity were 65 and 1890 lux, respectively. The mean and standard deviation of the lighting intensity were 449.2 ± 321.81 lux. The average and standard deviation of the uniformity index were also 0.72 ± 0.24. There was a statistically significant relationship between the average lighting intensity and the number of healthy lighting sources (P=0.030), uniformity index (P=0.046), wall reflection coefficient (P=0.001), and ceiling (P=0.001).
Conclusion: The results showed that 26.4% of small industrial workshops with a workforce of less than 20 people in the northeast region of Isfahan were deprived of desirable lighting conditions. The findings also indicated that the number of healthy lighting sources, surface color, uniformity index, wall and ceiling reflectance coefficient, cleanliness of the workplace air and lighting sources, and the cleanliness of windows and surfaces were effective in measuring lighting intensity.