Sinusoidal modulated light (here referred to as ripple coefficient 70%, (Max - min)/2/ RMS), may induce epilepsy if the frequency is 3-70Hz. If the frequency is between 100 hz and 120Hz, it can cause headaches. So 100Hz or 120Hz is not too far from 70Hz, so it's natural to get a headache. If it's not a headache, it could be something else.

Studies have shown that the negative effects of LED lighting are more pronounced, and these ideas are not unfounded. "When you work or study in a certain environment for a long time, you may feel dizzy, nauseous and so on. But when you step out of the environment and look at it from a distance, everything becomes comfortable. The culprit is probably ambient light. Because the vast majority of people do not understand light, they will put these problems down to space, air, mood and other factors. Today's LED lighting technology, with a little control over power management, can reduce stroboscopic light to levels that do not cause human health. However, due to the lack of proper supervision of the industry, manufacturers' malicious competition on price resulted in the neglect of the impact of the product on human health in order to save a little cost.

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