Now children, myopic.
From elementary school start myopia, a myopic degree is increasing rapidly in high school.
Why nature have academic heavy burden, the rapid development of the body, but the school classroom problems cannot be ignored.
After all school-age children school day at least five days a week, not ideal classroom lighting environment will directly affect the child's vision health.
So small and medium-sized school classroom
led lighting factors affecting children eyesight health what?
Now as to find out together!
1.
The light.
Primary and middle schools classroom lamps and lanterns is according to the standard layout with, but in fact it is difficult to ensure that any seat children any time in the light of the distribution is uniform.
The light too strong or too weak light or uneven distribution of light, will be harmful to the child's vision.
Over time, natural causes myopia or decreased vision.
2.
Spectrum.
Spectrum for optical spectrum, is after light after spectral dispersion system according to the size of the wavelength or frequency sequential pattern.
Spectrum of the more widely, the better the performance of its light color, use the higher comfort.
On the contrary, low color rendering index school classroom environment is easy to form the visual fatigue.
3.
Stroboscopic.
Perception of the human eye to light stroboscopic mainly depends on the amplitude and frequency of the guang-yuan yu brightness, high levels of modern science and technology, we normally visible to the naked eye can't detect whether there is a stroboscopic, but cause of headache in primary and middle schools classroom lamps and lanterns stroboscopic, eye fatigue, vision loss, there is a distraction, etc.
What are the standards of the classroom so campus?
1.
Intensity of illumination and the intensity of illumination evenness optimal: national standard GB7798 -
2010 rules, the classroom desk surface maintain plane illumination 300 or higher, intensity of illumination evenness 0 or higher.
7, to maintain the blackboard 500 or higher, the average illuminance on the intensity of illumination evenness 0 or higher.
8.
By the end of 2018, we have modified all 10000 primary and middle school classroom lights, more than 90% of the intensity of illumination and uniformity can not meet the national standard requirements.
Some schools even desktop and blackboard is only more than 100 lux, students learning for a long time in such a light environment, easy to cause eye fatigue, that cause myopia.
2.
Anti glare: gb regulation, the classroom led lighting glare value & lt;
19, while most of the school classroom led lighting using simple fluorescent stents, the light source directly exposed, the light is very dazzling, glare value more than 22.
So that the eye muscles too nervous, the serious influence students' concentration in class.
3.
: general fluorescent lamps and lanterns USES ac power source, current do periodic changes over time, the flashing of 100 times per second, lead to an unstable lamp brightness, learning under the stroboscopic light source, the visual system need to constantly adjust the eye pupil size to protect the stability of the retinal light intensity and imaging resolution, long time in this kind of light environment study, must make the pupil muscle fatigue due to excessive use.
4.
And blue light, and other harmful light: common LED light source of high frequency short wave - 400
Between 500 nm blue light, arrive to directly penetrate eye fundus macular ward, cause irreversible damage to the eyes, such as the formation of myopia.
The traditional led besides blue light damage, heat and uv, near ultraviolet, photochemical retinal, weak stimulation, small light source, infrared radiation of seven kinds of harmful light.
The 7 kinds of harmful light in different extent, serious harm to our eyes and body.
5.
Droop, prolong service life, lamps and lanterns of normal use after six months would be a serious light attenuation, cause the luminous flux decreases, which can not meet the national standards for, the brightness of the current in order to maintain standards, thus replacing the cycle for 2 to 6 months of lamps and lanterns, and need relevant maintenance personnel long-term maintenance, high maintenance cost and resource waste.
6.
Color rendering index optimization: ordinary fluorescent spectrum is not complete, resulting in lack of color and color.
Far less than the national standard Ra 80 or higher, and the colour of lamps and lanterns reduction ability is bad, will directly affect a child's color vision.
7.
Color temperature comfortable: national standard regulations, color temperature is 3300 -
5300 k, and the actual measurement results reached 6500 k color temperature is too high will lead to rising rates of radiation, blue blue also will increase, the blue light will increase due to genetic, environmental nutrition, health habits and old age related macular degeneration.
Night lessons for a period of time off will affect the students in melatonin secretion, reduce the sleep quality and influence on the second day of learning efficiency.
8.
Boycott fluorescent related hazards: fluorescent tubes containing heavy metal materials such as mercury, phosphor, mercury and phosphor if improper safekeeping and disposal of heavy metals, will do great harm to ecological environment, he can in a variety of forms into the ecological environment, pollution of soil, air and water directly.
Again through the food chain enter human body, directly harm the human body health, and fluorescent lamp luminous efficiency is low, general fluorescent lamp is only 50 lm/w.
Although fluorescent light is 365 degrees, but its basic there is no light in the opposite direction, although the reflected through the chimney, but the reflection efficiency is low, energy consumption is too high.
Of the fluorescent lamp ballast will emit sound that is harmful to the body.
So we should take action against school classroom reform, can effectively prevent the glare from the classroom.
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