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Five details that you have to pay attention to when choosing a long arm table lamp for eye protection

Source: http://www.qdjiashang.com/news/3875.html  Release time: 2018-10-25

In recent decades, children's eyesight problem has become more and more serious, not only because of the frequent use of electronic products such as mobile phones and computers, but also because children are under heavy academic pressure and need to sit at their desks for a long time. Most children have different degrees of myopia. As a place on the table or table, table lamp and lighting items, in fact, are also one of the main factors affecting children's visual acuity, and should not be careless when choosing. Let's see what kind of lamp is suitable for children! Eight hundred and eighty-eight thousand one hundred and eleven 1. Optical performance condition

Determine whether the lamp is qualified. Firstly, three optical performance requirements must be met. There are three main optical performance requirements for desk lamps in normal working positions. Eight hundred and eighty-eight thousand one hundred and eleven Shadow: If a person is sitting in a normal position and his eyes are looking horizontally, the inner wall and light source of the lampshade should not be seen;
Desk lamp lighting requirements: 250lx-500lx should be in the light of the working area, and the minimum lighting should be greater than or equal to 120lx. Eight hundred and eighty-eight thousand one hundred and eleven Requirements for uniformity of illumination: To alleviate eye fatigue, it is necessary to ensure that the working area is illuminated by a desk lamp. The illumination is relatively uniform, and can not produce special bright or dark spots. Optical performance requirements should be guaranteed. The ability is that Carl becomes a desk lamp. Eight hundred and eighty-eight thousand one hundred and eleven 2. Suitable light source
Radiation source
Thermal radiation light source is a kind of incoherent light source. Its light source converts heat energy into light energy in thermal equilibrium state, such as incandescent lamp, halogen tungsten lamp, etc. Radiation source has high color and continuous spectrum. Colour rendering can reflect how close an object's color is to that of sunlight in a particular light. Generally speaking, the higher the chroma (0-100), the more realistic the color restoration. In theory, this kind of light source is the most suitable. Eight hundred and eighty-eight thousand one hundred and eleven 3. The lamp cover should cover the lamp body. Eight hundred and eighty-eight thousand one hundred and eleven Many consumers and manufacturers also neglect the idea that the lampshade can cover the lampshade. In fact, this is a very important element, if the chimney can not cover the lamp body, then the eyes will be directly illuminated by strong light, affecting the user's vision. Eight hundred and eighty-eight thousand one hundred and eleven 4. Power and luminous flux
Why is the power of a light bulb so important? Because if the degree is too low, according to the dark light on the book, the eye is not easy to see the handwriting, which will cause eye fatigue, in the long run may also lead to myopia, generally speaking, choose more than 16W power, but the light bulb degree is not too high, too strong. Through the white paper into our eyes, there is glare, so that the pupil continues to shrink, causing eye pain and headache. 25-45 W incandescent lamp is the best brightness. In terms of light flux, it is more than 1200 Lm. Some counterfeit and inferior products use fluorescent powder instead of luminescent medium. The power is very high, but the luminous flux is not up to standard. Only power and light flux are considered qualified to protect the vision of the lamp. Eight hundred and eighty-eight thousand one hundred and eleven 5. The height of the lamp is
The height of the lamp is also an unsupervised factor. Usually, when the eyes are 30 centimeters away from the book, you can see the handwriting and not get too tired. According to this calculation, the height of the lamp is 40 centimeters or 50 centimeters, which ensures enough reading illumination and the surrounding environment. A certain brightness. The desk lamp is too low, the light illumination scope is small, the surrounding environment is completely dark. Loss of reference, can see far, can make the eye regulation system in a tense compression state, can only see near, the eyes will feel tired quickly, quickly accumulate, resulting in "enlightening myopia". Desk lamp is too high, although qualified chimneys are also used, the lamp can illuminate our eyes directly the same, produce glare, and close-range strong light can also cause retinal light stop phenomenon, long-term eye muscle contraction, worse vision ah F children. Eight hundred and eighty-eight thousand one hundred and eleven Nbsp;       what many consumers do not know is that it is best not to use color bulbs. Although color bulbs look cool, scientific research has shown that we have the best field of vision exposed to white light, so it is generally best to choose incandescent or frosted or LED lamps to emit soft, uniform white light instead of color bulbs. Eight hundred and eighty-eight thousand one hundred and eleven Electroluminescent light source (ELL) is a light source that makes solid matter emit light under the action of electric field. It converts electrical energy directly into light energy. LED is a typical example of electroluminescent light source. It is a light emitting diode. This kind of lamp is also more suitable for lamps. Eight hundred and eighty-eight thousand one hundred and eleven
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