Why Classroom Lighting Meets Health Standards Is So Important
In the general consciousness, it is "well known" that light affects vision, but the perception of the degree of impact is different. In fact, in addition to some congenital heredity, poor classroom lighting environment is one of the direct main reasons for students' myopia. The classroom is too dark, and the problem of stroboscopic light will lead to changes in the refractive system of the students' eyes, excessive adjustment of the intraocular muscles, and the occurrence of myopia. Everyday, using the mobile phone to turn on the lens and point it at the fluorescent light, the stroboscopic mobile phone screen that is invisible to the naked eye can be "recognized" - the screen will appear striped. In addition, long-term study in poor classroom lighting environment will easily lead to low-light bending or even lying on the table, causing students who are in the critical stage of development, growth and shaping to "can't stand up straight" or damage to their cervical vertebrae.
The "color rendering index" (referred to as the CRI for short, the index that evaluates the ability of a light source to display the original color of an object is called the color rendering index) is a lighting index that has received less attention. A high CRI is conducive to improving students' ability to recognize colors. The color rendering index of fluorescent lamps and low-quality LED light sources is around 70, that is, about 30 percent of the original color of the object is lost, and the color rendering ability of saturated red (R9) is generally low, or even negative. Long-term study in such a classroom lighting environment will inevitably lead to the decline and decline of color discrimination ability, resulting in color weakness and poor color discrimination ability.
The learning efficiency of students is inseparable from the color temperature (the evaluation index of the color emitted by the light source): when the color temperature is lower than 4000K and the light is soft, it is difficult for students to concentrate. The color temperature is higher than 6000K, and the light is white and easy to be excited and tired. Studies have shown that a color temperature of 5000K is more suitable for learning, which is more effective for teachers and students.
It can be seen that meeting the health standards of classroom lighting is one of the ways to effectively prevent students from having sub-health problems. It should not only meet the national standards, but also achieve the purpose of caring for the healthy growth of students in terms of various index coefficients.
