Is led desk lamp good for eyes?

Problems: First, from the perspective of electronic appliances: LED desk lamp, because the light source is LED, LED is a DC light-emitting device, which theoretically emits light, which is different from the light emitted by our previous generations. Traditional light sources include energy-saving lamps, metal halide lamps and incandescent lamps. , are AC, will change with the frequency of the input current of the civil power grid (China's power grid is 220V, 50HZ), so AC. If you use an LED desk lamp, it depends on whether you know how to choose. Not all LED lamps have no strongpoint. If a rechargeable battery is used, the light-emitting panel will not directly see the LED beads, and those without glare will protect your eyes until they are illuminated. Note that you must select a surface. The other is an LED desk lamp driven by a constant current power supply. If you don't know this product yourself, you should find a reputable manufacturer to buy it. Second, from the optical point of view: when the traditional light source emits light, it will emit light waves with red wavelength at the same time, which you can understand as invisible infrared. This kind of radiation with a wavelength above 780 nm will do harm to eyes. Myopia is mostly caused by long-term indoor work and study. LED light source is mainly yellow phosphor excited by blue chip, which emits light with wavelength of 380-780nm, without ultraviolet and infrared rays. A good LED light source (note that it is good, most of what you usually see in the shop outside does not match, and these good ones are exported at present) has a color rendering index greater than 85 (the higher the color rendering index, the closer it is to natural light), and the spectrum is relatively complete, that is, it has green light waves and is close to natural light at the same time. A real LED desk lamp (different from light efficiency, color rendering index, glare value, illuminance, luminous angle, etc. ) It's definitely good for your eyes.