Wavelength and color temperature
In natural, the wavelength may be used to decide the light color.the unit of wavelength is nm. which represents the different light color has different wavelength. please refer to list of wavelength as follows:
red: 650nm
green：555nm
yellow：590nm
orange：610nm
blue：500nm
ultraviolet:310nm such as:uv led strip

The wavelength are only targeting chromatic light . the white light is outside the range of wavelength unit. unit of white lightthrough color temperature of representatives.