Near- infrared light and far-infrared light. The two are often confused as the same thing but they are really quite different.
Infrared (IR) means “beyond (further on/near) red”. It begins just after the visible red light on electromagnetic spectrum. It was discovered in 1800 when a British astronomer created an experiment to measure the difference in temperature between the colors. He placed thermometers in the path of light within each color and found even warmer temperature measurement beyond the red end of the visible spectrum.
Infrared radiation is divided into three spectral bands, based on wavelength: near-, mid- and far-infrared. However, the measurements and boundaries between each infrared region vary slightly and so far, there is no consensus on uniform boundaries.
Far Infrared light is less clinically effective and quite different than Near-Infrared. While both lights offer very different benefits and treatments, they can both help us and can easily co-exist!