Choosing our LED products, two parameters “Peak Wavelength” and “Dominant Wavelength” are shown in selection. It may ask “What is the difference between them?”.
Peak Wavelength - It defines as the single wavelength where the radiometric emission spectrum of the light source reaches its maximum. Simply to state, it does not represent any perceived emission of the light source by the human eye, but rather by photo-detectors.
Dominant Wavelength - It is the single wavelength that is perceived by the human eye. Generally one light is consists of multiple wavelength spectrum from the light source rather than one wavelength. Our eyes perceive multiple wavelength spectrum of the light source rather than one wavelength. We may feel that it is one wavelength spectrum of the light source . That’s Dominant Wavelength.
In general, these two parameters have not big different, but it can consider our application when using these two parameters.
For example, if the LED is used in optical instruments to identify the wavelength, it should use Peak Wavelength for LED selection.
If the LED is used to show some instructions for human received, it should use Dominant Wavelength for LED selection.