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Discussion on whether LED light source can be used in classroom lighting Preface

Discussion on whether LED light source can be used in classroom lighting Preface

2019-05-23

LED is a solid-state semiconductor light source. In recent years, the lighting effect has been increasing and the price has been declining. Compared with the traditional light source, LED has many advantages such as small volume, adjustability and controllability, and long service life. LED lighting products have rapidly developed and have aroused wide attention in many application fields such as classroom lighting.

This paper discusses the issue "whether LED light source can be used in current classroom". This is currently being discussed and questioned by the public. This paper is intended to make it clear about related definitions and to convey correct understanding of relevant issues to the people.


Leimove-Discussion On Whether Led Light Source Can Be Used In Classroom Lighting Preface


Dispute over the use of LED light source for classroom lighting


At present, there are two main disputes about whether LED light source can be used in current classroom. First, is the LED light sourced allowed and recommended for use in classroom lighting according to the current national standard, under the circumstance that with the rapid development of LED technology, LED light is gradually replacing the "rare earth three-band fluorescent lamp" which was a mainstream in the past during the classroom lighting? Second, is the LED light source safe to the vision of children who are growing under the background that the quality of lighting products is getting more and more attention and blue light hazards, frequent flashes and other issues have become social hot topics? The following discussions will be focused on them.


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Is the LED light source allowed for use in classroom lighting according to the current and on-going national standard?

The current and on-going classroom lighting standards include the "Hygienic Standards for Lighting and Illumination in Primary and Middle Schools" (GB 7793-2010), "Design Standards for Primary and Middle Schools" (GB 50099-2011), “Design Standards for Lighting in Primary and Middle Schools and Kindergartens” (DB 31/539-2011), "Design Standards for Architectural Lighting" (GB 50034-2013), and "Technical Standards for Energy-saving Certification of Lighting Products in Primary and Middle Schools and Kindergartens" (CQC 3155-2016). They all have requirements on the average illumination and illumination uniformity of the classroom, the average illumination and illumination uniformity of the blackboard, the unified glare rating, the color rendering index, the color temperature of the light source, the efficiency of the lamp, and the power density. All these are applicable to all types of light sources. Whether it is LED or traditional light source, the corresponding parameters should meet the requirements of the said lighting standards when it is used in classroom lighting. Due to the development and popularization of LED lighting products, the standard for LED in classroom lighting is needed. It is the “Technical Standards for Energy-saving Certification of Lighting Products in Primary and Middle Schools and Kindergartens” released by China Quality Certification Center in 2016 that has further regulations on the parameters of LED light. Other standards for LED classroom lighting need to be improved.


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Is there a potential safety risk of LED light source?


At present, the lighting effect and lighting efficiency of white light LED for ordinary lighting have exceeded the traditional light source. It can achieve high color display and high stability and meet the requirements of intelligent lighting on dimming. The use of LED depends on whether the light can meet the requirements of lighting indicators and related lighting devices finally.

About the light bio-safety of LED, you can refer to the white paper "General Lighting LED and Blue Light" jointly released by the International Semiconductor Lighting Alliance, the National Semiconductor Lighting Engineering R&D and Industry Alliance and the China Illuminating Engineering Society in July 2013. The white paper clearly mentions the correct use of qualified ordinary lighting purpose white light LED products are completely safe for the human eyes.


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At present, there are many concerns about blue light, but we can't deny it blindly.


On the one hand, blue light is an important component of white light, which not only plays an important role in ensuring color rendering, but also regulates physiological rhythm. The outdoor sunlight can meet the requirement on synchronous regulation of human physiological rhythm (Or a biological clock).The blue light received indoors is far less than that received in outdoor activities. Blue light and cold white light sources can be used to establish a suitable light environment to help people get the required blue light every day to ensure that their physiological rhythm is coordinated with the natural circadian rhythm.

On the other hand, the "blue light hazard" we usually hear refers to 400-500 nm blue light band of light source. If the radiation brightness is too high, photochemistry damage may brought to the retina after long-time looking directly at the light source. The essence of the blue light problem is the combined effect of radiation brightness, blue light weighting function and time. From the spectrum only, the blue light ratio of LED spectrum increases when the color temperature rises, however, has no specials compared with the blue light of the fluorescent lamp spectrum. When the color temperature stays the same, the blue light safe brightness of the LED is similar to that of the fluorescent lamp. At home and abroad, there is a unified rating specification for blue light retina hazards: GB/T 20145-2006/IEC 62471.The LED light used for daily lighting belongs to Level 0 or Level 1 which is a scope of safety.


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LED light source for classroom lighting, what should be paid attention?


At present, the use of LED light in classroom has problems such as brand chaos, intermingled good & bad quality, unstandardized market, lack of regular maintenance, and imperfect standards. However, all these cannot be attributed to the LED light source itself. Here are things that should be paid attention to when the LED light is used in classroom lighting: first, the selected LED products should meet the requirements in terms of light color, quality, etc., including but not limited to safety grading requirements, performance requirements, reliability requirements, and environmental regulations; secondly, the light source and lighting system should be used correctly, including reasonable lighting design, correct installation methods, and regular inspection and maintenance; finally, all kinds of light sources and lighting systems should be tested for light biological safety, and users should still avoid looking directly at these light sources for a long time (especially in the case of a short distance)even if they are safe and need no additional warning signs according to standards.


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Note: Online pictures.  
This article is from the China Illuminating Engineering Journal.

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