1。 Turn on the camera function of the mobile phone and observe the screen carefully under the turned-on desk lamp. If the stripes emitted by the lamp flash badly, it means that it is more harmful to the eyes, indicating that the lamp does not have eye protection function.

2。 On the contrary, if the screen flicker is weak, this lamp has eye protection function.

The most important thing about eye protection lamp is that there is no stroboscopic light, which means that the brightness of this kind of lamp is stable and will not flicker, which is relative to fluorescent lamp. Because the current frequency of fluorescent lamp is 50Hz (Hz), the light of fluorescent lamp will flicker (that is, strobe), and its strobe speed is 50 times per second (that is, 100 times). The eye protection lamp adopts high-frequency electronic ballast to increase the current frequency to 30-50KHz. At this time, the response of human eyes can't keep up with this strobe speed. Moreover, the afterglow effect of fluorescent powder on the eye protection lamp tube greatly reduces the amplitude of this rapid stroboscopic, and the human eye can hardly feel the change of light, so it feels that the light is stable.

References:

Baidu encyclopedia eye protection lamp