1. The market demand for “eye protection desk lamps†comes from students’ excessive use of eyes.
The incidence of myopia in Chinese students in 2005 was 27% in primary schools, 53% in junior high school students, 73% in high school students, and 78% in college students. The low vision rate of high school graduates in coastal cities has reached 85%. The incidence of myopia in Chinese 15-year-old students is as high as 81%. More serious is the increased incidence of high myopia that can cause blindness.
In 2005, the rate of detection of poor eyesight among students in Beijing continued to rise, with 31% of primary school students, 62% of junior high school students, and 78% of high school students, which was higher than the national average. The detection rate of students with poor eyesight in Shanghai is the highest in the country, 42% of primary school students, 74% of junior high school students, and 81% of high school students, which is higher than the national average. The myopia rate of Chinese students has ranked second in the world. The number of adolescents blinded by myopia in China has reached 300,000. The vast majority of students' vision loss is caused by excessive eye use. With such a high proportion of myopia patients among students, and as people continue to deepen their understanding of the importance of vision protection, many lighting manufacturers have catered to the needs of the market, and have launched "new technology, new products" lighting table lamps - - "Eye-protecting table lamp".
2, the relationship between "eye protection" and the performance of table lamps has not undergone a rigorous scientific argument
Because the relationship between "eye protection" and the performance of table lamps has not undergone rigorous scientific argumentation, and "eye protection" lacks relevant medical clinical evidence, there is no scientific basis for the term "eye protection table lamp" on the market.
3. Characteristics of the so-called "eye protection table lamp" on the market
The so-called "eye protection table lamp" selling point in the market claims to be "no stroboscopic, with eye protection function". Most "eye protection" desk lamps use electronic ballasts to operate fluorescent lamps at high frequency currents. The frequency is usually above 20 kHz, which is 50 Hz compared to the use of an inductive ballast to operate a fluorescent lamp at a commercial frequency current. In other words, the naked eye can hardly feel high frequency flicker. However, even if it is not visible to the naked eye, stroboscopic still exists, but the stroboscopic light when the fluorescent lamp is operated by the high frequency electronic ballast is smaller than the strobe when the working frequency magnetic ballast is operated. However, the effect of high-frequency scintillation on visual research is not certain that the response of retinal nerves caused by high-frequency light stimulation affects the visual function of any sensory or motor nerve, so it is difficult to determine whether it can effectively protect the eye.
At present, many merchants use the gyro test method to prove to consumers the so-called eye protection effect of "eye protection table lamp". The gyro test method is a simple method to illustrate the stroboscopic effect. It only shows that the stroboscopic light when the fluorescent lamp is operated with the high frequency electronic ballast is smaller than the stroboscopic operation when the power frequency magnetic ballast is used. It cannot be proved. The effect of eye protection.
4. The comfortable lighting provided by the desk lamp can be scientifically evaluated.
The comfort of table lamp illumination is evaluated by the illuminance on the visual work, the ratio of the maximum illuminance/minimum illuminance on the visual work, the illuminance around the work, and the ratio of the work/surround/environmental brightness. The lighting requirements for general reading and writing operations are shown in Table 1. The lighting requirements for computer operations are shown in Table 2.
Table 1 Lighting requirements for general reading and writing operations
Table 2 Lighting requirements for computer work
5. Relevant standards for providing comfortable lighting table lamps a) GB7000.11-1999 "Safety requirements for portable general-purpose lamps";
b) GB7000.1-2002 "General Safety Requirements and Tests for Luminaires";
c) GB 17743-1999 "Limitations and methods of measurement of radio disturbance characteristics of electrical lighting and similar equipment";
d) GB17625.1-2003 "Electromagnetic compatibility limit harmonic current emission limit (device input current per phase ≤ 16A)";
Lamps that provide comfortable lighting should meet the following requirements in addition to the safety and electromagnetic compatibility standards covered by the above 3C certification:
e) GB/T9473-200X "Performance Requirements for Reading and Writing Table Lamps";
f) GB50034-2004 "Architectural Lighting Design Standards";
g) ISO 8995:2002/CIE S 008/E-2001 "Indoor workplace lighting".
6, the purchase of comfortable lighting table lamps should pay attention to the problem
a) Note that the lampshade of the desk lamp should have a considerable amount of upward illuminating light, and the illuminating light illuminates the surrounding environment. If only the light that is illuminating downward is too concentrated, the illuminance is high in a limited area, but if the range is not large, visual fatigue will occur after a period of use.
b) The height should be ≥ 40cm, preferably adjustable. If the height of the luminaire is below 40cm, it is flush with the human eye or slightly lower, it is easy to produce a large contrast between light and dark, so that the eye is constantly adjusting to adapt to changes in light and dark. At the same time, the structure of the luminaire should properly block the strong light on the side. When the eye is at a height of 40cm, the inner wall of the reflector and the light source should not be seen, otherwise glare will be caused. These are all likely to cause visual fatigue, and long-term use can affect vision.
c) When purchasing desk lamps for computer operation, pay attention to the height of the desk lamp, which is higher than the computer. Otherwise, the surrounding environment will become darker, so that the eyes will constantly adapt to the changes of light and dark, which is prone to visual fatigue. The formation of myopia has a great relationship with the improper use of the eye. Excessive use of the eye is an important reason for the formation of myopia. At the same time, the formation of myopia has a certain relationship with genetics and nutrition. No matter what kind of lamps are used, it will not prevent the fatigue caused by long-term use of the eye. There is no scientific basis for betting the child's eyesight to the "eye protection table lamp". The key to prevention and treatment of myopia is to develop the habit of scientific use of the eye, pay attention to their own eye hygiene, sitting posture must be correct when reading, it is best to take a break every 45 minutes to avoid eye fatigue. At the same time, pay attention to the use of local lighting and overall lighting to form a comfortable lighting environment, which is beneficial to protect the eyes.
Power Bank HUB,Hub Station 2.0,Transfer file hub USB2.0
shenzhen ns-idae technology co.,ltd , https://www.best-charger.com