Why are all the lights in the library dark yellow?

Hello, about this problem, yellow light wave is long and penetrating, which can illuminate far away places without dazzling (the current exercise books are all yellow for this reason, including libraries and other places). The overall lighting in the museum is yellow, which is more suitable for students to study. but

The lighting standard value of library building is based on the lighting survey results of 46 libraries in six major regions of China, referring to the original national standards, CIE standards and lighting standards of some countries, and is formulated after comprehensive analysis and research. 1. Most of the reading rooms surveyed are provincial and municipal libraries and some university libraries. The illuminance of more than half of reading rooms is between 200-300 1x, and the average illuminance is 339 1 x, while the original standard high-grade illuminance is 300 1x, CIE standard is 500 1x, and both the United States and Russia are 30065438. According to the field evaluation, 150~250 1x basically meets the visual requirements. According to the current situation in our country, the general reading room in this standard is set at 300 1x, and the reading rooms for the aged, rare books and maps in national, provincial and municipal libraries are set at 5001x.2. According to the survey results of illumination in exhibition room, catalog room and cashier room, more than half of them are set at 200 1x on average, while the original. The foreign standard is between 200-3001x. 3. According to the survey results of stacks, most of the illuminance is below 150 1x, except for the high illuminance in the United States, where the x is between 50 ~ 50 ~ 75 1x in Japan and Russia. 4. The average illuminance in the workshop is between 200-300 1x, while the original standard is 300 1x.. Considering the need of book restoration, this standard is set at 300 1x.5, and the glare value (UGR) and color rendering index (R2) of each room are subject to CIE standard "Indoor Workplace Lighting".