In the past few years, eye-protection lamps have been favored by the market. As the name suggests, eye-protection lamps can protect people's eyesight. Recently, a friend asked me if my LED has an eye-protection lamp? I answered this question very cautiously:
1, the principle of eye protection
In fact, the past eye-protection lamps were fluorescent lamps using electronic ballasts. China's national power grid is AC frequency of 50Hz. For desk lamps that use power frequency AC, the output light exhibits periodic light and dark changes with alternating current. This is the stroboscopic effect. After the eye-protection lamp adopts an electronic rectifier, the frequency is increased from 50 Hz to a frequency of 20 kHz and above, and the stroboscopic efficiency is greatly improved. If the alternating current is converted to direct current, there is no stroboscopic. From this perspective, eye protection is good for protecting your vision.
Figure 1 Block diagram of passive filter and active filter electronic ballast
It is not so much a technical advancement as it is a master of business models, but also a factor of flickering. Compared with the power frequency 50Hz table lamp, the eye protection lamp has certain advantages for protecting the eyes.
2. What is the role of LED eye protection?
We can analyze from the influence of people's vision.
1) The stroboscopic effect is harmful to human vision
We can use the video function in the mobile phone to determine the stroboscopic effect of the LED light. Turn the phone to the shooting video mode and align it with the LED light to watch. If the video picture shows periodic changes in brightness and jitter, it indicates a stroboscopic effect. The more jitter, the more severe the stroboscopic effect. From the technical indicators, the stroboscopic ratio (see the article I pushed before) should be controlled within 10%. It is best for students to use the "eye protection lamp" to control the indicator within 6%.
Figure 2 stroboscopic effect
2) Blu-ray is harmful to vision
The blue light hazard has always been the focus of the public. The article I pushed before has made a detailed explanation on this issue. Here you can tell everyone the final conclusion: the color temperature of the eye protection lamp should not exceed 4000K. How to judge? When purchasing, do not buy white light, the color of the light should be slightly yellow.
Figure 3 color temperature diagram
3) High brightness difference also affects vision
If the brightness difference between the eye light and the background light is too large, it may cause eye fatigue. Therefore, it is not possible to turn off the room ceiling light only with the eye protection table lamp.
3. Conclusion
In fact, the eye protection lamp is not important, as long as the above requirements are met, other types of table lamps are also desirable. At the same time, pay attention to eye hygiene, pay attention to the rest and recovery of the eyes.
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