Can blue light LED enter the classroom?

2018-06-26 965

        "The student had better use natural light to read a book, natural spectrum is seven colors", now, at the advent of eyeful day, the light source that guangzhou classroom AIDS in illume USES to arouse a part of expert concern. Used to work at harvard medical school in the United States, is currently in sun yat-sen university students science college professor, doctoral tutor professor wen-liang zhou said "if you want to use auxiliary illuminant, at present the most LED lights market single blue light is too strong, from the perspective of protecting teenagers eyes, personally, I temporarily not recommended to use in the classroom."

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        The newly renovated three-color light source classroom

        Students are advised to use natural light

        "Students it is best to use natural light", the national health development planning commission school hygiene standards committee mak said that chengdu is QiSeGuang natural sunlight, light source close to the sun is the most safe, "but, on the specific use of it, the school the classroom window side and by the side walls, natural light, there is a big deviation that would make the classroom needs to be installed within the reasonable auxiliary light source."

        Health posts just retired wheat from guangzhou education department engaged in classroom design and so on ten years, chengdu, he argues, the most close to the sunlight spectrum light source is the most suitable as the lighting source of the classroom.

        The auxiliary light source of student classroom attracts the attention of experts

        So, exactly what classroom auxiliary light source is better?

        According to McJincheng, a member of the school health standards committee of the national health and family planning commission, the current standards related to school classroom lighting include:

        (1) gb7793-2010 "hygienic standards for lighting and lighting in classrooms of primary and secondary schools" article 5.5 "the classroom adopts rare earth tricolor fluorescent lamps with narrow pipe diameter less than 26mm"; (2) gb50034-2013 article 3.2.2 of the architectural lighting design standard, "it is advisable to use thin tubular tricolor fluorescent lamps in rooms with low installation height of lamps"; (3) jgj310-2013 article 8.4.3 of education code of architectural electrical design, "it is advisable to use the three-base color fluorescent lamp of fine tube diameter in reading room, library, classroom, meeting room and office".

        With the development of LED in emerging industries, some schools in guangzhou have started to use LED as auxiliary light source to enter classrooms, playgrounds and other places, which has attracted the attention of experts such as McJincheng and zhou wenliang.

        Among them, recently, sun yat-sen university student science college professor wen-liang zhou has just completed a report on the white LED blue light visual damage and the visual impact review articles, some even in the world is a new point of view.

        The professor warned the classroom with leds

        Professor wen-liang zhou: "it should be said, in strict accordance with the national standard through evaluating the blu-ray, in the national standard limit use of white LED color temperature scope, is safe for adults, in the past few years the rapid development of white LED effectively promotes the development of semiconductor lighting industry. However, white LED is only one kind of semiconductor lighting, which has prominent advantages and is good for general indoor lighting. But for children and adolescents, the risk is there, especially in classrooms where students stay longer.

        Wen-liang zhou, says professor of lighting on the market at present basic all is white LED, LED by blue chip stimulation of yellow phosphor and compound to form white light, this is the lowest cost to obtain white light, is widely used.

        However, it also has disadvantages. Due to the use of blue light pump, it is inevitable to contain excessive blue light components, and the higher the color temperature, the more. Recently, although the country has issued some standards for the harm caused by LED blue light, these standards are for adults, not necessarily for young children.

        Excessive blue light can lead to retinal damage

        Zhou wenliang said that excessive blue light may lead to retinal damage and confusion in the body's circadian rhythm.

        "It's impossible to do experiments with people," zhou said, adding that some animal experiments have found that low-light, low-temperature white leds are not always safe. Therefore, there is a big controversy about LED lights. From the perspective of protecting students' health, I do not advocate the application of LED lights in the classroom. "The playground outside the classroom, the hallway and so on can be illuminated by LED lights."

        How can ability prevent teenager myopia?

        Abroad, research has shown that teens who spend three hours a day outside the home are 30% less likely to suffer from myopia than children who spend three hours outside, he said.

        Three hours a day "teenagers outdoor activities may not be realistic", Michael suggested that chengdu, each school, it is better to organize students to engage in outdoor activities, for an hour every day in order to reduce the proportion of teenagers suffer from myopia.

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