Background research: China's health lighting has a long way to go

- Nov 20, 2019-

In 2008, the Ministry of Education issued the “Work Plan for Prevention and Control of Myopia for Primary and Secondary School Students” to strengthen the work of protecting students' vision. The visual health of young people was put on the agenda.


However, the incidence of myopia in children and adolescents is increasing year by year, high incidence, and younger age. According to the results of the 2018 National Child and Adolescent Myopia Survey, the myopia rate of primary school students in China is 36.0%, that of junior high school students is 71.6%, that of high school students is 81.0%, and that of ten high school students is eight. According to another incomplete statistics, the number of patients with myopia in China has exceeded 450 million, and the prevalence of myopia in college students is as high as 95%. Myopia has become one of the serious harms to public health in Chinese society.


In August 2018, General Secretary Xi Jinping made an important instruction: it is necessary to take care of the children's eyes and let them have a bright future. Subsequently, the Ministry of Education, the National Health and Health Commission, the State General Administration of Sports, the Ministry of Finance, the Ministry of Human Resources and Social Security, the State Administration of Markets, the State Press and Publication Administration, and the State Administration of Radio and Television, eight ministries and commissions jointly issued the "Integrated Prevention and Control of Children and Adolescents." The implementation plan for myopia has clarified the requirements of specific indicators, and the vision health problems of adolescents have entered an extremely urgent stage.


Frequent policies: the light environment of young people is worrying


An important factor affecting the health of adolescents' vision is the unqualified classroom lighting environment. In addition to meeting basic lighting functions and aesthetic requirements, lighting has also received increasing attention to its physical and psychological effects. A healthy lighting environment not only reduces eye fatigue, regulates body rhythms, improves people's mood, but also improves efficiency.


In the author's investigation and interview, it is found that the current classroom lighting environment is extremely severe, and there are widespread problems such as illumination and uniformity, indication, stroboscopic and glare. Even the lighting failure rate of some provinces and cities is as high as 98%. The household lighting is only based on the "bright" standard. There is no light quality. The long-term exposure of young people to poor lighting environment is one of the main causes of myopia.


Insufficient brightness. The illumination and illumination uniformity of blackboards and desks are generally lower than the standards set by the state. From the actual measurement situation, the illumination of most school classrooms is less than 200LX, and the illumination of some school classrooms is less than one-third of the standard value, or even more. low. At present, the standard illumination requirement for vision care in Asia is between 500-750 and 500-800.


The glare is serious. Most of the classroom's blackboards are directly equipped with bare fluorescent tubes, even with simple bracket lights, mostly bare light sources or without anti-glare treatment, and the glare value is seriously high. While watching the blackboard, the students are affected by the direct glare of the lamp, which makes it difficult to concentrate, reduce the learning efficiency, and is easy to visual fatigue, which may lead to myopia in the long run;


The strobe is severe. Fluorescent lamps are generally equipped with electronic ballasts (even inductive ballasts), which have serious stroboscopic effects. The student's visual system is over-regulated frequently, which is bound to cause visual fatigue.


Poor light quality. Mainly reflected in the low index and R9 are low, most classrooms generally use high color temperature (6500K) fluorescent tube, because the light color is too white, and the blue component is too much, it is easy to cause students to be excited, fatigue, and even cause insomnia ;


Illumination uniformity is poor. Uneven brightness and brightness directly affect students' attention and vision health.


Industry pain points: products are uneven


Standard chaos


Therefore, the light environment in our classrooms needs to be improved, and the hotspots of healthy lighting renovation have also started. In recent years, discussions on light quality and health care lighting have been in full swing, and the research on the mechanism of influence of light on human health has continued to deepen. Many large lighting companies are competing to switch to the field of healthy lighting and launching high-quality health lighting. However, behind the development of the healthy and healthy lighting industry, there are huge hidden concerns.


On the one hand, the concept of health lighting has not really been clarified, and there is no uniform standard saying so far.


Dr. Xie Zhiguo, deputy general manager of Guoxing Optoelectronics White Light Devices Division, a domestic health lighting device expert believes that health lighting is a light source produced by advanced technology based on the elements of healthy light demand, combined with human settlements for scientific and detailed scene division, through intelligence Control mode to provide a reasonable healthy light environment. Health has different standards for different people, so there is no uniform standard. At present, it is recognized by the public that the light of the solar spectrum is similar, the visible light band is similar to sunlight, and the color rendering index Ra is close to 100.


On the other hand, the standard is chaotic The quality of LED lighting products on the market is mixed, which casts a shadow on LED health lighting.


According to the inspection by authoritative organizations, inferior LED lamps will produce blue light that is harmful to the human body, which may lead to eyesight, cataracts, blindness and other different degrees of eye diseases. Some of the bad manufacturers are using the concept of healthy lighting, confusing the audio-visual, producing the inferior "pseudo-health" products under the banner of healthy lighting, hurting the visual health of consumers and affecting the development of the entire industry. Dr. Xie Zhiguo of Guoxing Optoelectronics called on relevant professional supervision departments to increase the promotion and promotion of product inspection and regular manufacturers, improve the awareness of health lighting in the society, and promote the healthy development of the entire health lighting industry.


Technical Difficulties: Cross-border Research Spectral Design Lighting Design and Lighting Design


Professional health lighting products are not only the improvement of light efficiency, but also the pursuit of excellent light quality in combination with human body mechanism and lighting environment. Health lighting is a true “cross-border” study, and its complexity determines the difficulty and length of research.


Deputy Director Zhou Jiaxuan of the Lighting and Health Laboratory of the Eye Vision Hospital of Wenzhou Medical University said: "We need a variety of data when formulating classroom reform standards. From the perspective of eye health, we should consider both." Full visual pathway", that is, measurement of human eye parameters, measurement of optometry parameters, visual perception and cognitive function, and clarify the relationship between these visual health related parameters and physical parameters of the light source. This is our optical optics And some thoughts on this issue from the perspective of visual science."


In the view of Dr. Xie Zhiguo of Guoxing Optoelectronics, in order to create a safe, comfortable and friendly light environment, there are three major technical points that need to be broken: the first is the spectral design of the light source, that is, to meet high light efficiency and meet high light quality; 2 is the design of lighting fixtures, to make reasonable design of the selected light source, to avoid glare, strobo and other undesirable factors; the third is to make reasonable lighting design for the selected lamps, use space under a reasonable illumination condition to create a Good atmosphere. The technical difficulties of these three aspects require LED packaging, luminaires and lighting designers to work together to study the corresponding technical points, and to combine the advantages of these aspects to promote the application to the environment of light environment requirements, so that these technologies are in a wider range. Application to further promote technological advances in this area.


Professor Liu Muqing from the Institute of Electric Light Sources of Fudan University also put forward: "How light passes through the eye channel makes people physiologically and psychologically healthier. We must study and form standards or norms of related products based on research. This requires the business community, Universities and research institutions work together."


Although there are many challenges and difficulties in health lighting, with the pursuit of healthy living, the research around human health, sensory experience and intelligence will become the focus of the industry. It is foreseeable that with the continuous advancement of research, healthy lighting It is becoming one of the most important development directions in the field of lighting.


At the same time, adolescent health as a major issue affecting the future of the country and the nation, prevention and control of children's and adolescents' vision health problems is urgent, and it requires the government, schools, medical and health institutions, families, students and other aspects to work together, and the whole society needs to act together and protect them together. Good boy's eyes.