The light-emitting diode, like the semi-conductor laser, is a PN junction that emits light by injecting electrons into it from an external power source.
So far, the lighting field that LED enters is only the so-called particular lighting field, such as car lighting, urban landscape lighting, museum cultural relic art lighting, and backlight lighting.
The LED industry is a new industry rising at the beginning of this century. With the rapid development of science and technology, the high-tech field has become one of the focuses of international competitions.
To facilitate you to better understand the article, in understanding why the light bulbs series resistance, I would like to give you a little bit of knowledge about resistance.