As is known to all, except in the home, teenagers who spent much of their time in school.
In 2010, the Beijing municipal education commission and the municipal bureau of health for the health monitoring of the school teaching environment.
According to the results, the city's small and medium-sized school classroom desks surface average illuminance on the percent of pass is 60.
3%, the blackboard average illuminance on the percent of pass is only 22.
9%, the classroom and blackboard conditions 1496 substandard schools, intensity of illumination is generally low, the effect not beautiful.
The vast majority of schools with poor
light environment in our country, mainly displays in the following respects: 1.
The blackboard and the desks of illuminance and intensity of illumination evenness is generally lower than the standards stipulated by the state, the student has long been under low illumination, poor uniformity of light environment study, easy to cause visual fatigue.
2.
Most of the classroom blackboard installed directly exposed fluorescent tube, while looking at the blackboard, students can see the direct glare of the tubes, difficulty concentrating, thus reducing the learning efficiency, and easy to visual fatigue, long-term easily lead to myopia.
3.
Fluorescent lamps and lanterns is usually configured inductance ballasts, there are serious stroboscopic effect.
Student's visual system to adapt to the change of frequency, frequent adjustment, will inevitably cause eyestrain.
4.
Most of the classroom are generally high colour temperature (
6500 k)
Fluorescent tube, because the light is white, and blue components is more, easy to cause the students excited and fatigue, and even cause insomnia.
Detailed the classroom requirements are as follows: 1 all the classroom should be installed.
2 classroom desks on maintaining the average illuminance value should not be less than 300 lx, the intensity of illumination uniformity should not be lower than 0.
7.
3 classroom blackboard should establish local lamp, for its average illuminance should not be less than 500 lx, intensity of illumination uniformity should not be lower than 0.
8.
4 classroom appropriate USES 3300 ~ 5500 k color temperature of light source, light source color rendering index should not be less than 80.
The unity of the five classroom glare value (
UGR）
Should not be greater than 19.
6 in maintaining the average illuminance value under the condition of 300 lx, classroom power density current value should not be greater than 11 w / ㎡, the target should be 9 w / ㎡.
7 design to calculate the intensity of illumination, the effect of maintenance department for 0.
8.
Therefore, in order to effectively avoid the effect of school vision to the student, the school should use professional eye LED lamps and lanterns of the classroom, and have professional and technical personnel to be responsible for the installation, to ensure that the classroom light and blackboard light of each index can meet the requirements of qualified, ensure that every classroom light environment not only sufficient illumination and uniformity is excellent, at the same time to minimise glare, no direct light into the eyes of the students.
At the same time, adjust the position of lamps and lanterns is in the classroom, try to avoid the classroom in the light of superposition and corner light, really provide students with healthy, comfortable, light green classroom environment.
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