Views: 7 Author: Site Editor Publish Time: 2022-04-29 Origin: Site
However, in order to take into account the soft and light and high enough brightness, many eye protection lamps use tube materials with the characteristics of "high-frequency flash", which is very harmful to the eyes and difficult to detect by the naked eye. Therefore, the purchase of eye protection lamps has become a top priority in the hearts of many parents. So, what should we pay attention to when choosing eye protection lamps?
At first glance, the word "illuminance" is very profound. In fact, generally speaking, "illuminance" can be simply understood as whether the lamp is bright enough. We all know that the light with low brightness is the direct culprit of myopia: reading and writing in dark light for a long time can easily lead to visual fatigue and myopia in serious cases. For the illuminance of desk lamps in China, the performance requirements for reading and writing desk lamps issued in 2008 put forward specific requirements: take the light source as the center, the measurement range is 30 cm and 50 cm as the radius respectively, and the illuminance should reach 150lx and 250xl respectively.
All eye protection lamps that meet this condition on the market meet the national CQC technical specifications. Therefore, when purchasing desk lamps and considering the illuminance, you can identify those with CQC marks. In addition, when you use eye protection lamps, it is also recommended that you turn on other indoor light sources as backlight, so as not to cause obvious light and shade differences in the room.
Glare, generally speaking, refers to whether the light is dazzling or not. It is an important index to evaluate the performance of eye protection 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 is. When purchasing eye protection lamps, we should try to choose the lamp group that can not see the inner wall of the transmitter and the light source; Eye protection lamps with shading accessories can also be considered, such as setting lens, grid and other anti glare measures to increase the light cutting angle of lamps and reduce glare.
Remember not to directly use the exposed bulb to avoid direct light. In addition, when choosing desktop materials, we should also pay attention not to choose shiny desktop as far as possible. Such materials will reflect the brightness of lamps, ceilings and walls, produce reflective glare and hurt our eyes.
Color rendering refers to the restoration degree of the table lamp to the color of the object, which is also an important consideration for us to choose eye protection lamp. We are exposed to many different types of lighting every day: such as incandescent lights, neon lights, LED lights and so on. It is not difficult to find that objects are under different types of lights. The color will make a difference. Therefore, we should choose lamps with corresponding color rendering according to our own needs: for example, we should draw similar pictures under the table lamp. For some things with high color requirements, it is suggested that the color rendering index of the eye protection lamp we choose should be at least 90%.
Blue light now seems to have become a major culprit in damaging people's vision: when blue light reaches a certain intensity, it may cause photochemical damage to the retina, causing macular disease and cataract. Especially for children who are not yet adults, the lens is much clearer than adults, and the blue light is easier to reach the fundus and damage the retina.
The composition of blue light generally exists in all kinds of lamps and light sources. Even the seemingly soft warm color light also contains blue light. If the light of eye protection lamp is particularly bright and white, giving people a feeling of blue, it is that the proportion of blue light is too high! We must pay attention to avoid such eye protection lamps! Of course, the best way is still to choose the eye protection lamp with CQC logo for protection.
The height of eye protection lamp is also a factor that cannot be ignored: Generally speaking, when the eyes are 30 cm away from the book, they can see the handwriting clearly and will not be excessively tired. Based on this calculation, the height of eye protection lamp is more appropriate to be 40-50 cm away from the writing, so as to ensure sufficient reading lighting and a certain brightness of the surrounding environment: the height of eye protection lamp is too low, the range of light exposure is small, and the surrounding is dark, It will make the eye adjustment systems in a tense and compressed state of only looking at the near place, and the eyes will soon feel tired, resulting in "light source myopia" for a long time. The eye protection lamp is too high, even if there is a qualified lampshade, it is useless. The light will also directly shine on our eyes, causing light retention on the retina, and eye muscle contraction for a long time, causing greater damage to the eyes.
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