Compared with the traditional light source, the LED light source also has one characteristic: the luminous efficiency of the traditional light source of the finished product is basically fixed; but the LED light source is not like this. When a certain amount of current is given to the LED, the value of the luminous flux generated by the LED is considerable. At this time, the measurement of its luminous efficiency can even reach about 200 lm/w. With the increase of driving current, the luminous flux produced by LED will also increase (but the increasing speed will slow down). This is the biggest difference between LED light source and traditional light source, but also one of the main reasons why modern people choose LED light as artificial light source.