On the market, there is no real LED eye lamp (data)?

Recently Beijing City metrology Science Research Institute of green light industry testing center staff of 6 kinds of simulation environment lighting lamp light radiation hazard detection, results showed that, according to the national standard, there are 4 kinds of LED lamps to detect blue light hazards 6 lamps, and risk rating for the 1 types of risk. A "blue light hazard" attention again, and on the market a lot of LED lamp eye eye is again being questioned, the protection of health and safety laboratory visual Chinese standardization institute director Cai Jianqi for LED eye is healthy eye, puts forward the evaluation index.

First, the concept of eye protection

The first is security: the light source should be no damage to the human eye.

The second is the low visual fatigue effect, can inhibit the development of myopia induced or effect, namely product design based on the main causes of myopia, myopia causes mainly can be classified into four types: congenital (this doesn't change), reading habits (this can be partially corrected), light environmental impact (this can be improved by product design), human ciliary muscle (the excessive regulation need to be solved by combining the physiological curve of the human eye and intelligence).

Finally, in the case of ensuring the above requirements, taking into account the efficiency of the people, that is, mental workload.

Different ethnic tolerance to light is different, we Chinese (Mongolia East Asian and Caucasian race) difference is mainly two aspects: one is the pupil diameter, which determines the amount of light into the eye, we are 3-5mm, white is 6-8mm; on the other hand is the skin pigment light tolerance. Our white pigment is relatively high, so we compared them with more light tolerance. This is why a lot of data in the international standard is not suitable for our cause, we also analyzed the cause of 8000 times of human physiology experiments, we light and they have very big difference.

Two, evaluation index

Cai Jianqi believes that the evaluation of physical index evaluation of product is not directly influence on people's health, so its use for evaluation method, namely through the large sample of people by the method of physiological experiment data form the adult eye physiological index evaluation model to evaluate the effect of light on the people. At present, the visual comfort index (VICO) has been completed, which is an index to evaluate the effect of light on human visual fatigue, and cell viability index (CV). At present, their team is working with CSA to jointly develop the standards of the union, is a pilot group of national standards, and ongoing international standards and the International Union of industry standards proposal.

Currently on the market, Cai Jianqi think there is no real eye protection lamp! They have done 600 cases of human visual testing, including the test of Philips, Panasonic and domestic two brands, as well as a lot of people talk about Dr. Edward's lights, the results are not good. Including last week, a Xiamen Company manager said in the group made a CCFL lamp, to protect the eyes, but the results from the CCFL light source test, most of the CCFL is not as high as the LED light source. Eye care, at least it should be less than 2 of the value of VICO (slight fatigue rating), but these lights are above the value of 2.

As mentioned above, eye protection, should consider the three elements, if not considered, it is difficult to achieve this effect! LED to provide a change in the design of the light source, which is CCFL can not be achieved, for the Chinese characteristics of lighting design, Cai Jianqi think should be needed!

Figure: Cai Jianqi's team experiment to get a corresponding curve, but in fact, only a part of the subjective qualitative, not quantitative, and the volatility is too large.

Figure: Cai Jianqi's team in five areas of Southeast China's northwest region to do the human eye vision experiment, completed in 2013, a total of 5000 people participated in the experiment. The conclusions have been identified through scientific and technological achievements, the conclusions for the international leader; some of the results have been published, is currently drafting the relevant standards.

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