More than 50 years ago, when Nick Holoniak presented his LED to the president of GE in Fairfield, Connecticut, he knew that the incandescent light bulb would be replaced by leds. While incandescent bulbs are still the most important source of domestic lighting, leds have transformed electricity in ways that Mr. Holonako never thought possible.

From the appearance of the first dark red light-emitting diode, to the street lighting used in most cities today, LED has been stamped with its brand around the world. The ubiquitous red LED beads. The world's first LED beads were dark red, created more than 50 years ago, and the color was not chosen for aesthetic reasons. Leds are made by placing multiple layers of semiconductor wafers on top of a chip. After the multilayer chip is implanted, dopants are added. These dopants are the substances that determine the color of the LED. Tiny wafers are placed in a molten liquid, followed by metal contacts and wires. The mixture used in the first LED lamp -- gallium arsenide phosphorus -- ended up showing a natural red color. That's why many kinds of lights are red.

With the continuous development and progress of science and technology, the new technology makes the color of LED lights become more diverse. The colorful LED lights can not only be used for battery indicators, but also become alarm signal lights and so on. But for the first 10 years of leds, LED lights were always red. Because they are relatively cheap, low-power leds are starting to replace incandescent bulbs in the electronics industry, and such electronic components are becoming more affordable.

In 1972, "Paisha" this century-old watchmaking enterprise first used LED technology, the first LED watch was born, named "time machine". The watch claims to be extremely accurate, with the time within 60 seconds for each year. Of course, since this is the first time leds have been used in small pieces and the watch relies on electronic components to tell the time, the watch is also expensive, costing $2,100. It's a shame that the watch's power consumption is so high because of the new technology that it requires the wearer to use a button to check the time.