SEE RELATED: Does red light therapy protect the eyes? The perils and benefits of UV This is why the invisible rays just beyond the visible light spectrum are called ultraviolet (UV) radiation. On the other end of the visible light spectrum, blue light rays with the shortest wavelengths (and highest energy) are sometimes called blue-violet or violet light. (But these lamps also emit visible red light so people know the lamps are on! The same is true for other types of heat lamps.) The “warming lamps” you see in restaurants emit infrared radiation. Invisible rays just beyond the red end of the visible light spectrum are called infrared radiation. Those on the red end of the spectrum have long wavelengths and less energy. Rays on the blue end of the visible light spectrum have short wavelengths and high energy. Light rays that have short wavelengths have more energy and those with longer wavelengths contain less energy. Without getting into complicated physics, there's an inverse relationship between the wavelength of a light ray and the amount of energy it contains. Digital electronic devices emit blue light.
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