In addition to strobe, there are also "four major standards" to help parents choose LED lights.
At the 315 party, CCTV No. 1 consumer warning of LED learning lights, the test personnel proved that the high-frequency flashing learning lights are very harmful to the eyes, and the naked eye is difficult to detect. The murder of the eye is not only stroboscopic, but also in many ways.
Every day, with the lights, especially the students, it is common practice to pick up the lights and read them at night. The news of the light hurting the eyes is frequent, so the parents are anxious, is the "eye protection" lamp really eye-protecting?
Nowadays, the eye-protection lamps on the market are very hot, and the word “eye-protection†that everyone cares about seems to give this lantern a magical effect. Compared with ordinary lamps, it has a more “prestige†status and status. There are hundreds more. Parents are especially keen on buying good eye-protection lights, and watching small children set up a pair of small glasses, which is really "unbearable pain in the bridge of the nose."
In fact, the state does not give a standard and definition for eye protection. "Eye protection" is only a kind of speculation and marketing means of the merchant. The so-called eye protection lamp is actually a reading lamp. The scientific name can be called a visual operation desk lamp. . Therefore, no lamp can really protect the eyes, and some are just good reading lights.
Then, in the "light sea" of the forest, what kind of lamp is the best for the eyes?
The professional certification of the China Quality Certification Center (CQC) has set a good mark for consumers' purchases in advance. So for how to choose a good eye protection lamp, CQC experts tell us that there are four criteria to measure.
First, illuminance and illuminance uniformity
Illumination can be easily understood as the light is not bright enough. Reading and writing in the darker light for a long time can easily lead to visual fatigue. In severe cases, it will cause myopia; illumination uniformity means that the illumination is not enough.
China's national standard GB/T 9473-2008 "Reading and writing work table lamp performance requirements" puts requirements on the illumination and illumination uniformity of the desk lamp. The technical specifications of CQC stipulate two illumination levels on the basis of national standards: A grade and AA level.
Centered on the light source, the measurement range is 30 cm and 50 cm, respectively. Class A: Illumination should be 150lx within 50cm from the core of the light, at least 250lx within 30cm from the core of the light; AA is twice as high as A, and the illumination level is higher, if it needs to work longer under the lamp Time, it is recommended to use a table lamp with high illumination level.
When parents choose a desk lamp, they can look for the CQC logo. In addition, when the child uses the reading light, it is not recommended to open only the desk lamp, but to open other indoor light sources as backlight, do not cause obvious difference between the interior and the interior.
Second, glare
Glare, which means that the light thorn is not glare, is an important indicator for evaluating the performance of the table lamp. As the light source itself, the higher the brightness, the more obvious the glare; the closer the light source is to the line of sight, the more obvious the glare.
How can I avoid glare? The child should sit in the normal reading and writing position and look at the light. The inner wall of the transmitter and the light source should not be visible.
Secondly, parents can consider using lamps with light-shielding accessories, such as setting lenses, grilles and other anti-glare measures to increase the cut-off angle of the lamps and reduce glare; do not directly use the bare bulbs to avoid direct light.
In addition, you should also pay attention to the choice of desktop materials, try not to choose a glossy desktop, will reflect the brightness of the lamps, ceilings and walls, resulting in reflective glare.
Third, color rendering
Color rendering refers to the degree of reduction of the color of the object. We can access many different types of illumination sources, incandescent, fluorescent and LED lights every day. It is not difficult to find that the color of the object will be produced under different fluorescent or LED lights. difference.
The color rendering index is an important indicator for measuring color rendering. This value ranges from 1 to 100. A larger value indicates a better reductive color to the object.
When parents buy lamps for children, their color rendering index is generally greater than 80. If you want to do something like color painting under the desk lamp, it is recommended that the color rendering index of the desk lamp be at least 90.
Fourth, blue light
News about the hazard of blue light has been frequently seen in the media in recent years. When the blue light reaches a certain level of intensity, it may cause photochemical damage to the retina, causing macular degeneration and cataract. Especially in children, the lens is much clearer than adults, and blue light is more likely to reach the fundus and damage the retina.
The composition of blue light is common in all kinds of lamps and light sources, even if the daily incandescent lamp emits warm light, it also contains blue light. If the light of the artificial light source is particularly bright and white, it gives a blue-blue feel, that is, the proportion of blue light is too high.
The International Lighting Society has divided the lighting products on the blue light hazard of the human eye into four levels: non-hazardous (RG0), low-risk (RG1), medium-risk (RG2) and high-risk. Class (RG3 class).
The level of blue light hazard is related to the distance between the light source and the person. The further away from the human body, the less harmful. The CQC technical specification requires that the blue light hazard level of the desk lamp be non-hazardous, that is, the logo is RGO. This type of desk lamp can protect the children's eyes to the greatest extent. Therefore, parents should choose CQC certification when purchasing the desk lamp. The logo can be.
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