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In recent years, the myopia rate of adolescents and children in China has remained high and rising, which has seriously affected the health of adolescents and children. Poor school lighting environment is one of the reasons for the decline of vision. In 2018, the Ministry of Education, in conjunction with eight ministries and commissions, issued the Implementation Plan for Comprehensive Prevention and Control of Children and Adolescent Myopia, in which it is required to improve the classroom lighting environment and use healthy lighting equipment. How to purchase classroom lamps?
1、 Standard for classroom lighting
At present, the relevant standards for classroom lighting are as follows:
GB 7000.201 Luminaires Part 2-1: Special requirements Fixed general purpose luminaires
GB 7000.202 Luminaires Part 2-2: Special Requirements Embedded Luminaires
GB 7793 Hygienic Standard for Lighting and Lighting of Classrooms in Primary and Secondary Schools
GB 50099 Code for Design of Primary and Secondary Schools
GB 50034 Standard for Lighting Design of Buildings
CQC 3155 Technical Specification for Energy-saving Certification of Classroom Lighting Products in Primary and Secondary Schools and Kindergartens
Among the six standards mentioned above, GB7000.201 and GB7000.202 specify the most basic electrical and mechanical safety requirements for classroom lamps, and CQC 3155 specifies the performance requirements for classroom lamps such as light quality, luminous efficiency, stroboscopic and blue light, as well as the performance requirements for equipped light sources and ballasts; The three project standards GB 7793, GB 50099 and GB 50034 are not directly aimed at lamps, but specify the lighting environment requirements for classroom lighting, that is, the lighting effect that the classroom should achieve after the installation of lamps. They mainly specify four indicators: illumination level, illumination uniformity, uniform glare and lighting power density.
2、 Key indicators for selecting and purchasing classroom lamps
1. Color characteristics of lamps
Color rendering index. The general color rendering index Ra is usually used to evaluate the color rendering ability of lamps and lanterns to objects. The value is between 0-100, and the larger the value is, the closer the reaction of lamps and lanterns to the color of objects is to the true color, which is generally required to be above 80. Compared with other classrooms, art classrooms have higher requirements for color rendering, and Ra is required to be above 90. When evaluating the color rendering of LED lamps, in addition to the requirement of Ra, there is also a requirement for the special color rendering index R9, which is usually greater than 0.
Chromaticity tolerance. Evaluate the deviation between the actual color of the lamp and the target color. The deviation value is divided into four grades according to 1, 3, 5 and 7. The smaller the deviation value is, the closer the description and the design target color are, the better the color control of the lamp is.
2. Lighting comfort
The lighting comfort is evaluated by the overall lighting effect achieved after the installation of lamps in the classroom, mainly including illuminance, illuminance uniformity and uniform glare index (UGR). Illuminance, that is, whether the light in the classroom is sufficient. The assessment area includes the writing board area and the student learning area; Illumination uniformity, that is, whether the illumination in each area of the classroom is uniform; The unified glare index is a representation of the degree of uncomfortable glare in the whole lighting space. It is generally divided into five levels: 28 (too strong, intolerable), 22 (unpleasant, uncomfortable), 19 (unpleasant mood, acceptable), 16 (acceptable, perceptible), 10 (difficult to detect, perceptible).
3. Impact on human body
Including retinal blue light hazard, stroboscopic and other indicators.
Retinal blue light hazard. Blue light generally exists in all kinds of light sources. When the blue light reaches a certain intensity and enters the retina, it may cause photochemical damage to the retina, cause macular lesions and cataracts, especially in children. The lens is much clearer than that of adults. Blue light is easier to reach the fundus of the eye directly and damage the retina. The luminous principle of LED light sources determines that the composition of blue light in these light sources is generally relatively high, which needs to be limited.
Strobe. In short, the light emitted by the light source changes with a certain frequency and period over time. The greater the light fluctuation, the more serious the flicker. There are many reasons for flicker, which may be caused by unstable power supply, or the principle of light source, or the unreasonable design of light source control device. According to relevant biological and medical research, flicker may cause harm to the human body, lead to the decline of visual performance, cause visual fatigue, and even cause serious health problems such as epilepsy, migraine and headache.
Therefore, it is recommended that schools choose eye-protecting and healthy led lamps when choosing classroom lighting lamps. The classroom eye-protection lamps of Huahui Education Lighting have high illumination, good illumination uniformity, no stroboscopic, no blue light hazard, and can provide students with high-quality lighting environment in the classroom.
Huahui Lighting is specially used for classroom lighting lamps - led eye-protection classroom lamp and led eye-protection blackboard lamp. The average (constant) illumination of the desk is more than 300lx and the illumination uniformity is 0.7 in accordance with the national standard; The blackboard maintains an average (constant) illuminance of 500lx and an illuminance uniformity of 0.8; The color rendering index is greater than 90, and the color reversibility is high; The grille anti-glare design is adopted, and the glare value is less than 16, which is not dazzling; The color temperature is 5000K, comfortable and soft; The illumination of the whole classroom is uniform, without stroboscopic and blue light hazard.
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