1, traditional fluorescent lamp (fluorescent lamp). The alternating current in China is 50Hz, which means it changes 50 times per second. However, traditional fluorescent lamps emit light by low-pressure gas discharge, and the afterglow time of fluorescence is very short. After alternating current is applied, stroboscopic phenomenon is the most serious. Although this frequency is imperceptible to human eyes, research shows that these stroboscopic phenomena will make long-term users feel eye fatigue and even lead to decreased vision.
2. Electric lamps (incandescent lamps and halogen lamps). Ordinary incandescent lamp is actually a kind of eye protection lamp, because alternating current heats the filament first and then emits light. Because the filament has heat capacity, when the power supply changes, the filament is still hot, and the afterglow is much longer than that of fluorescent lamp, so the change of light and shade will not be as drastic as that of fluorescent lamp (fluorescent lamp).
3, high frequency lights. High frequency, that is, it changes tens of thousands of times per second. Because people's eyes can't change at all, they can be said to be "unchanged" to protect their eyes. Some upgraded high-frequency lamps, considering the influence of light reflection on human eyes, add filters, which can effectively increase the required illumination and reduce unnecessary illumination, but there is still no way to completely solve the problem of stroboscopic.
The above is an introduction to the types of eye protection lamps. I believe that everyone has some understanding through the above, and I hope it will be useful to everyone.