Monochromatic

Light that comprises only a single wavelength of light. This is very rare in nature, where the majority of colors have a broadband Illuminant (e.g. D65 daylight). Some sources of Monochromatic Light includes:

• Refracted Polychromatic Light, such as a rainbow
• Lasers

Because Monochromatic colors comprise a single wavelength, they are equivalent to Spectral Colors.