Blue light hazard standard to be enforced in student classrooms

1. What are the prevention and control plans and standards for juvenile myopia?
1.1 Adolescent myopia prevention and control program:
With the increasing rate of myopia among teenagers, more and more students are becoming shortsighted. In order to protect the children’s eyes and let them have a bright future. Eight ministries and commissions including the Ministry of Education and the National Health Commission have also jointly issued the Implementation Plan for “Comprehensive Prevention and Control of Myopia in Children and Adolescents”.

1.2 Standards for prevention and control of myopia in adolescents:
In order to implement the spirit of General Secretary Xi Jinping’s important instructions and the requirements in the “Plan”, to ensure that children and adolescents can use qualified lighting lamps and teaching supplies, and to better protect the visual health of children and adolescents, the Department of Laws and Regulations, the Department of Diseases of the National Health and Health Commission Under the guidance of the National Health Standards Committee, the School Health Standards Professional Committee of the National Health Standards Committee organized the drafting of GB 40070-2021 “Sanitary Requirements for the Prevention and Control of Myopia in School Supplies for Children and Adolescents”. The standard was released on 20th February, 2021, and officially implemented from 1st, March, 2022. It is a mandatory national standard with a transition period, and relevant enterprises are encouraged to apply it in advance.

2. What is the content of myopia prevention and control standards?
2.1 Contents of myopia prevention and control standards:
The standard specifies textbooks, teaching aids, learning magazines, school books, examination papers, learning newspapers, preschool children’s learning books, as well as general classroom lighting, reading and writing desk lamps and teaching multimedia related to myopia prevention and control requirement for students.

2.2 What are the areas where myopia prevention and control standards are adapted
Applicable to the production, operation and provision of school supplies for children and adolescents by enterprises, primary and secondary schools, secondary vocational schools, kindergartens and off-campus training institutions (including textbooks, teaching auxiliary materials, learning magazines, course books, examination papers, learning newspapers, Preschool children’s learning books, general classroom lighting, reading and writing lamps, teaching multimedia products, etc.).

3. Interpretation of GB 40070-2021 standard:
3.1 GB 40070-2021 General classroom lighting fixtures and reading and writing workbench requirements
Ordinary classroom lighting fixtures are fixed general-purpose lamps or recessed lamps, and reading and writing desk lamps are portable general-purpose lamps. The above products are listed in the National Compulsory Product Certification Catalog. In order to ensure the quality and safety of lamps and lanterns used by children and adolescents, this standard requires that ordinary classroom lighting lamps and reading and writing desk lamps should pass the national compulsory product certification (ie CCC certification).

3.2 Correlated color temperature is a measure of the color of light
Correlated color temperature is a measure of the color of light. When the correlated color temperature is around 3000 K, the light color is yellowish; when the correlated color temperature is above 5000 K, the light color is blueish. Lights with different correlated color temperatures have different lighting and visual effects. This standard stipulates that the correlated color temperature of lighting fixtures used in ordinary classrooms should not be less than 3300 K, and should not be greater than 5300 K. This aspect limits the possible damage to human eyes caused by light sources with high color temperature, and at the same time ensures that the light is bright and soft, with Help students focus. The limit of correlated color temperature in this standard is based on the intermediate color temperature specified by the International Commission on Illumination (CIE), which is consistent with the current relevant domestic standards.

3.3 The color rendering index is a measure of the color rendering of the light source
The color rendering index is a measure of the color rendering of a light source and is used to evaluate the ability of a light source to restore color. The higher the color rendering index, the higher the degree of color reproduction, and the easier it is for the human eye to distinguish the color of an object. Under normal circumstances, the general color rendering index Ra used for indoor lighting sources should not be less than 80. In addition, in order to adapt to the use of LED lamps and ensure RGB three colors from the perspective of color rendering, this standard specifies the requirement that the special color rendering index Ra of LED lamps should be greater than 0, which is consistent with the relevant standards in my country. (The so-called Ra is the ability to display red in the color rendering index of the lamp. The larger the value, the higher the reducibility of red. The red, green and blue cone cells in the human eye have different sensitivities. If there is a lack of red light, It will cause green light and blue light to form a cyan image in human eyes, reducing the color gamut of color reproduction, which not only causes the lighting scene to be dull and uninteresting, but also affects the quality of the lighting environment.)

3.4 Blue light hazard requirements for general lighting fixtures
In order to prevent the eyes from being damaged by excessive blue light in the learning process of children and adolescents, this standard refers to CIE S009, IEC 62471 and IEC 62778 standards, and adopts the highest safety level, which stipulates that the blue light hazard group of general classroom lighting should reach IEC/ RG0 of TR 62778 blue light hazard group. Considering that the blackboard local lighting fixtures are used for classroom blackboard area lighting, the outgoing light should not directly enter the human eye, and at the same time, considering the blue light hazard, the light distribution design of the fixtures, the uniformity of the blackboard illumination, and the current stage of production of the current lighting fixture manufacturers This standard stipulates that the blue light hazard group of blackboard lamps is RG0 or RG1, and this requirement is also consistent with the current domestic and foreign standards such as GB 7000.1 and IEC 60598-1. (The harm of blue light to the human eye is mainly manifested in the eye pathological harm and human rhythm harm that cause myopia, cataract and macular degeneration.

3.5 The fluctuation depth is a parameter that characterizes the stroboscopic characteristics of the light source
The fluctuation depth is a parameter that characterizes the stroboscopic characteristics of the light source. Lamps will flicker when driven by AC or pulsed DC power, causing visual fatigue and brain fatigue. At present, the relevant requirements of IEEE Std 1789-2015 are widely used at home and abroad to evaluate and observe the flicker of light sources in a static state. The requirements of this standard for flicker (fluctuation depth) are consistent with it.

4. What are the main manifestations of blue light hazards?
4.1 Blue light hazard – loss structure
Harmful blue light has extremely high energy and can penetrate the lens directly to the retina, causing the atrophy or even death of retinal pigment epithelial cells. The death of light-sensitive cells can lead to decreased vision or even complete loss of vision, and this damage is irreversible. Blue light can also cause macular degeneration. The lens in the human eye will absorb part of the blue light and gradually become cloudy to form cataracts, while most of the blue light will penetrate the lens, especially in children, the lens is clear and cannot effectively block blue light, which is more likely to cause macular degeneration and cataracts.

4.2 Blue light harms – visual fatigue
Due to the short wavelength of blue light, the focal point does not fall in the center of the retina, but rather in front of the retina. To see clearly, the eyes will be in a state of tension for a long time, causing visual fatigue. Long-term visual fatigue may lead to symptoms such as deepening myopia, diplopia, easy serialization when reading, and inability to concentrate, affecting people’s learning and work efficiency.

4.3 Blue light hazard affects sleep
Blue light inhibits the secretion of melatonin, an important hormone that affects sleep and is known to promote sleep and regulate jet lag. This can also explain why playing mobile phones or tablets before going to bed can cause poor sleep quality or even difficulty falling asleep.

5. What is Lisun’s solution and test report for blue light hazard?
5.1 LISUN Solution:
(1) LISUN design and manufacture IEC62471-2006(CIE S009) Photobiological Safety of Lamps and Lamp System and IEC TR62471-2(2009) Guidance on Manufacturing Requirements Relating to Non-laser Optical Radiation Safety have be published addressing hazard to human (mostly eye and skin), and are completely suitable to assess the optical radiation safety of non-laser sources, such as LED products, UV radiation in general lighting products and etc. The hazard exposure level of optical radiation may be related from 200nm to 3000nm. It is based on the measurement of spectral irradiance and spectral radiance in specified measuring geometry relating with exposure duration. This solution suit for the lab and company who budget is enough.

 

(2) LISUN also design and manufacture LMS-6000B Portable spectroradiometer for the some customer just do simple blue light hazard test.

5.2 Test report

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Tags：EN62471-C , LMS-6000