technology, scientists hope to solve the myopia problem fundamentally through artificial intervention and treatment. However, although the development of modern medicine can solve many difficult problems that once troubled human beings, it still cannot prevent and eliminate myopia from the root cause. Through experiments on various factors affecting vision, we found that the main cause of vision decline in young people is lighting. Traditional eye-protecting lamps use high-frequency ballasts to achieve the goal of increasing the frequency, which makes the electromagnetic radiation of eye-protecting lamps much higher than that of general appliances, several times or even tens of times higher than mobile phones and computers, seriously affecting vision. The emergence of LED lighting technology provides us with a way to eliminate this problem. This paper proposes an intelligent supplementary lighting system based on single-chip microcomputer control, which simulates the natural sunlight at 9 and 10 o'clock in the morning all day long, completely eliminating flicker, radiation, and glare, effectively eliminating ultraviolet and infrared rays in traditional light sources. It can effectively reduce the damage to human eyes caused by the darkening or brightening of light, and can effectively reduce the consumption of electricity, energy-saving and environmentally friendly. Aiming at the phenomenon that the myopia rate is still high in modern society, this paper proposes an LED intelligent supplementary lighting system based on MCS-51 single-chip microcomputer to automatically collect and adjust the external light, in order to reduce the harm to human eyes caused by the darkening and brightening of external light. The experimental results show that the brightness of LED lamps can change softly according to the change of external light, without flicker and glare. The change of external light and luminous flux is collected by the photosensitive resistor, and the collected change value is compared with the reference value and sent to the single-chip microcomputer for calculation. The MCU controls the digital output to change the current flowing through the LED lamp to adjust the brightness of the LED lamp, so as to run in a state close to natural light and realize intelligent supplementary lighting. Keywords: desk lamp, illuminance, PWM dimming, automatic adjustment
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