How much harm does LED stroboscopic do to people's eyes?

Now people not only pay attention to the physical performance effect of lighting, but also attach great importance to the photobiological safety of lighting. Frequency flash source will stimulate people's visual system and produce uncomfortable feeling. Usually flicker is divided into visible flicker and invisible flicker according to human feelings. When the frequency is greater than 100Hz, the human eye can't feel the flicker phenomenon, but it will still cause eye fatigue and headache, which is the result of stroboscopic. It is generally believed that this effect exists within 500 Hz.