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What are LEDs?

Wavelength and color

The LED color (emission wavelength) will change depending on materials used.
This makes it possible to customize the color to meet certain wavelength specifications required for applications that use traditional bulbs as light sources (for which standards exist), such as traffic lights and automotive lamps.
Two specifications for wavelength are used to indicate color: λP (Peak Wavelength) and λD (Dominant Wavelength), with λD corresponding to the color actually seen by the human eye.

CIE Chromaticity Diagram