The wavelength of LED

For the spectral characteristics of LED, we mainly look at whether its monochromaticity is excellent, and we should pay attention to whether the main colors of red, yellow, blue, green, white LED are pure. Because in many situations, such as traffic lights, color requirements are relatively strict. However, it has been observed that some LED signal lights in China have green turning blue and red turning deep red. From this phenomenon, it is necessary and meaningful to conduct specialized research on the spectral characteristics of LEDs.