According to a new study by the World Health Organization, the number of myopia in China has now reached 600 million, accounting for almost half of the country's total population.

Scientists believe that, in addition to subjective factors such as incorrect posture, excessive use of the eye, and too close to the object, bad light is also very harmful to the eyes.

Therefore, there are many eye protection lights on the market, mainly for the function of protecting eyesight. So, in the face of many lamps with the "eye protection" sign, how to choose a smart eye protection table lamp?

A. Purchasing points

Illuminance & Illumination Uniformity

Illumination can be simply understood as whether the light is bright enough; the uniformity of illuminance, that is, whether the light is uniform enough.

Reading and writing under a desk lamp with low light or uneven illumination for a long time can easily lead to visual fatigue and, in severe cases, myopia.

my country's national standard GB/T 9473-2008 "Performance Requirements for Reading and Writing Table Lamps" has requirements for the illuminance and uniformity of illuminance of table lamps. The technical specifications of CQC stipulate two illuminance levels on the basis of national standards. A grade and AA grade.

Class A: The illuminance within 50 cm from the core area of the lamp should reach 150 lux, and the illuminance within 30 cm from the core area of the lamp should be at least 250 lux. If you need to work under a desk lamp for a long time, it is recommended to use a desk lamp with high illumination.

Parents can refer to the illuminance indicated on the product when buying a lamp, or choose a lamp with the CQC logo.

In addition, when children use the reading lamp, they should not only turn on the desk lamp, but also turn on other light sources in the room as a backlight, so as not to cause obvious light and dark differences in the room.

Glare, which refers to whether the light is dazzling or not, is an important indicator for evaluating the performance of a desk 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 we avoid glare?

Children sitting in the normal reading and writing position and looking at the light should not see the emission wall and light source; secondly, parents can consider using lamps with shading accessories, such as setting lenses, fences and other anti-glare measures to increase the light interception angle of the lamps , Reduce glare.

Be careful not to use bare bulbs directly and avoid direct light. In addition, you should also pay attention to the choice of desktop materials, try not to choose a bright desktop, the brightness of the lamps will be reflected on the ceiling and walls, resulting in reflected glare.

Blue light refers to light with a wavelength between 400 and 500 nanometers. In fact, the component of blue light is widespread in all kinds of lamps and light sources, even the warm light emitted by everyday incandescent lamps also contains blue component.

If the light of the artificial light source is particularly bright, particularly white, giving people a blue feeling, then the proportion of blue light is too high.

The degree of harm of blue light is related to the distance between the light source and the person. The farther away from the human body, the smaller the harm.

Therefore, when purchasing a desk lamp, parents are advised to choose an LED desk lamp with a color temperature below 4000K. When using a desk lamp, as long as you pay attention to the distance, it will generally not cause harm, and parents can use it with confidence.

Color rendering refers to the degree of restoration of the color of the object by the lamp.

The color rendering index is an important indicator used to measure color rendering. Its value ranges from 1 to 100. The larger the value, the better the color reproduction of the object.

For some things with higher color requirements, it is recommended that the color rendering index of the lamp should be at least 90.

Stroboscopic, that is, the lamp's stroboscopic ratio can be in the low-risk range. Under the AC frequency of 50Hz, a lamp with a flicker percentage of less than 8% should be selected.