How to optimize the use of natural light in the classroom also needs to be considered. If too much sunlight enters the classroom, there will be a strong contrast between light and shade near the window, which will produce glare and affect people's visual comfort, which is not conducive to visual health. Some reference materials related to architecture will give the upper limit of the range of lighting-related indicators.
The group standard "Code for Design of Healthy Lighting in Primary and Secondary Schools" (T/CIES 030-2020) stipulates that "the natural illumination of the desktop near the window in the south-facing lighting classroom should not be greater than 3000lx, and the sunshade system should be used when it exceeds." However, there are few or no requirements and regulations for sunshade system in domestic standards. It can make good use of natural light, which is not only beneficial to human health, but also can respond to the national call for energy conservation and environmental protection.
Selection of light source:
Light sources can be divided into natural light sources and artificial light sources, and artificial light sources are commonly used in classroom lamps, such as fluorescent lamps and LED lamps. Natural light is one of the natural light sources, which affects human health. Natural light can adjust the biological clock, improve sleep, improve people's mood, relieve seasonal affective disorder (SAD), relieve depressive symptoms, promote the absorption of calcium and phosphorus, and be beneficial to eyesight.
Therefore, the importance of natural light in classroom lighting has been paid more and more attention, and natural light should be given priority to during the day, supplemented by artificial lighting. In recent years, healthy LED lamps simulating natural light have become a research hotspot.