According to Chellappa et al., indoors with desirable light can increase employees' comfort, productivity, health, and welfare ( 15). Therefore, light source and color temperature in designing artificial light, especially with fluorescent sources, is very important to satisfy visual or nonvisual requirements ( 14). However, fluorescent, as well as positive effects on mood and consciousness, can cause detrimental effects on mental performance. Munch et al., emphasizing the importance of that, found that in light with a fluorescent source and lighting conditions with the temperature of 6500 Kelvin (K), the highest consciousness level, satisfaction, welfare, and visual comfort as well as immediate reaction in activities was resulted. Duff examined compressed fluorescent lamps used in residential areas (regarding light and color temperature) are significant health and safety aspects ( 13). Some studies have shown that visual fatigue and discomfort caused by light sources can influence the body and cause pressure on the nervous system ( 12). Studies reveal that CCT and light sources during working hours can influence people's consciousness, performance, and recovery ( 11). Corrected color temperature as a factor has an effective role in visual ergonomic parameters consistent with the functional characteristics of the person in the workplace ( 10). If the CCT is higher than 4000 K, it is cold light if it is lower than 3000 K, it is warm light ( 8, 9).
In addition to physiological effects, studies indicate that exposure to light surfaces with different sources and CCT can influence people's consciousness, conception, and performance ( 7). Investigations show that different amounts of light and CCT, as two important parameters in light, create various mental and physical effects on humans ( 6). Light recognition depends on the intensity, and its quality depends on the color temperature. Quantitative components of light such as source and corrected color temperature (CCT) are important ( 4, 5) "recommendation of occupational exposure limits (2016 - 2017)". In addition to maintaining health, this factor provides more desirable and pleasant conditions for people, and it also can create relaxation and increase outcomes in different residential, official, and industrial environments ( 3). Light, generally and specifically, is one of humans' basic physical and mental needs ( 2). BackgroundĪmong different factors that exist in workplaces, such as humidity, temperature, limited workplace, inappropriate light, noise, and dust, light is of crucial importance ( 1). Illumination Daylight Vision Mood Visual Acuities LED Fluorescence CCT 1.
Therefore, using sunlight in educational environments can improve the mood and state of students. Light sources can influence mood and vision states (acuity and color recognition) under different lighting conditions.
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