![]() ![]() Other than workplaces for specific tasks, the living and working environment is suggested to have warm or intermediate lighting. The temperature of lights has 3 categories: warm (5300k). In bedrooms, the suggested illuminance is between 75 lux and 150 lux. For tasks such as writing, typing, reading, data processing and workstation, the suggested illuminance is around 500 lux. Finally, a short conclusion is drawn in Section 6.Īccording to EN 12464, the recommended illuminance of typical office tasks varies from 200 lux to 750 lux. Section 5 discusses results regarding comfort/discomfort of different illumination setups and the relations among different measures. Section 3 presents the materials and methods of the experiment, and the experiment results are shown in Section 4. The remainder of the paper is arranged as follows: In Section 2, we briefly reviewed different aspects of the ideal lighting, comfort/discomfort and related subjective and objective measures. For this, two research questions were defined as: 1) What types of desktop lights are proper for the comfortable use of a computer screen in a dark environment? and 2) What are the factors that influence the comfort/discomfort of users in this condition? It is expected that the answers to these questions may highlight the focuses of artificial light design for the comfortable use of computer screens in the context of performing leisure tasks in the dark environment. The objective of this research is to identify the optimal desktop lighting for the comfortable use of the computer screen in a dark environment. However, extensive literature search did not reveal enough studies about the comfortable illumination setup for using a computer screen in the dark environment, especially in the leisure time. They concluded that the light intensity and the color temperature of the light may affect human’s mood, alertness and may lead to differences in their performance. factories and offices, regarding the performance of workers. Many researchers studied the influence of the quality of light on humans in different conditions, for instance, Juslén and Tenner investigated the influence of different lighting conditions in workplaces, e.g. Good lighting conditions could improve productivity, while in contrast, inappropriate lighting conditions may cause discomfort, decrease task performance, lead to feelings of fatigue and even result in health problems. These post challenges on the design of lighting for the comfortable use of computer screens in the evening. And the purposes of the usage and the contents displayed on the screen are also more diverse compared to the usage in the daytime. However, in the evening, the artificial light and bright computer screens become the primary light source for the usage of computers. In daytime, the artificial light in public places, either as the primary or the secondary sources, are more likely to be designed for people to stay alert or enhance their working efficiency. For young adults, research indicated that the use of social media and computer gaming are the two dominating leisure time activities. ![]() And many of them also work at evening due to the tendency of less rigid norms in regard to the (full-time) working day and week. People perform different activities on the computer screen in their leisure time: playing video games, online shopping, chatting with friends, reading/sending emails, viewing social media, reading news, etc. in a study on the use of screen-based media devices within 1 hour before the sleep, 71.5% adolescents reported the use of at least one type of such a device at night time. This is especially true for the younger generation, e.g. ![]() During the weekdays, the 1.5 hours was spent mostly in the evening. In the U.S., an individual uses a computer for leisure about 1.5 hours on an average weekday and 2.33 hours per day on weekends. ![]() For instance, Europeans spent two to three hours in front of a screen per day outside of work. Using a computer/a laptop/a mobile phone is be-coming a daily activity of many people in both working and leisure. ![]()
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