What is Light Spectrum

Horace He

Last Updated: October 16, 2023

What is Light Spectrum

Light Spectrum, also known as the electromagnetic spectrum, is the range of wavelengths of electromagnetic radiation. It encompasses all types of light energy, including visible light and other forms of light that are invisible to the human eye. Visible light, which humans can see, falls within a specific range of wavelengths from approximately 380 nanometers (nm) to 780 nm. This range of visible light is what we perceive as different colors. Visible light is just a small part of the entire electromagnetic spectrum.

In addition to visible light, the light spectrum includes other types of light that are invisible to the human eye. These include infrared, ultraviolet, X-rays, gamma rays, and cosmic rays. Infrared light has longer wavelengths than visible light and is associated with heat or thermal energy. Ultraviolet light has shorter wavelengths than visible light and can cause sunburns. X-rays and gamma rays have even shorter wavelengths and are forms of ionizing radiation. Cosmic rays are high-energy particles originating from outside the Earth’s atmosphere.

Different light sources can have different spectral distributions, resulting in variations in the colors of light they emit. By analyzing the light spectrum, lighting professionals can select appropriate light sources for specific applications, taking into account factors such as color rendering and visual perception.

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