First, the white light emitted by the led eye lamp is too strong. In this kind of light, reading and writing will feel reflective or glare, causing visual fatigue and decreased vision.
Since most of the current eye-protection lamps use LEDs as the light source, and LEDs emit white light, the disadvantage of white light compared to yellow light is that people feel reflective or glaring, so when students look at things under white light, After a long period of time (usually more than 15 minutes), your eyes will feel tired or soar. Why is this? In fact, the yellow spot inside the human eye (that is, the yellow color of the eye) is the most acceptable yellow light instead of white light, which is why it is soft to read and write under the yellow light. Comfortable, but under the white light will feel the root cause of glare or fatigue.
Second, the ordinary table lamp will have stroboscopic light, which will cause certain damage to the students' eyes and skin.
The main selling point of the so-called eye-protection lamp is that there is no stroboscopic light, which means that the light of this lamp is stable and will not flash. This is compared with the fluorescent lamp. Since the current frequency of the fluorescent lamp is 50 Hz, the light of the fluorescent lamp will have a flashing sensation (strobe), and the speed of this flashing is exactly 50 per second. Back and forth (that is, 100 times). The eye-protection lamp is to avoid the feeling of flashing and flashing. The high-frequency electronic rectifier is used to adjust the current frequency to several kilohertz or even tens of thousands of hertz, which means that the speed of the light flashes to a few seconds per second. Thousands or even tens of thousands of times. When the speed of light flashes to tens of thousands of times per second, the reaction of the human eye can no longer keep up with this speed. At this time, there is a feeling that the light does not flash, It is stable.
(Note: When the bicycle is riding slowly, we can see that the wheel is made of steel wire, but when the bicycle rides quickly, we can't see the wire at all, only see a circle). Therefore, the eye-protection lamp is in the true sense: it should not be stroboscopic, but high-frequency flashing, which is high enough that the human eye can't feel it. It is this feature of the eye-protection lamp that emits light that is more stable and comfortable than a fluorescent lamp. However, high-frequency electronic rectifiers pose a serious problem, that is, high-frequency electromagnetic radiation is generated. High-frequency electromagnetic radiation is harmful to humans, especially to the brains of students who are at a developmental stage. Many parents know that the electromagnetic radiation of mobile phones is harmful to students, so children should use mobile phones as little as possible, but they do not know that the electromagnetic radiation generated by eye protection lamps is far more harmful than mobile phones because of their higher frequency and time of use. Longer.
Laundry Cabinet,Laundry Wash Tub,Laundry Ceramic
Yiqian Sanitary Ware Co., Ltd. , http://www.zj-furnitures.com