Different sources use different boundaries for the far infrared.
Far infrared light.
Far infrared light the safest segment of energy that comes from the sun offers a wide array of therapeutic benefits for various health conditions.
Studies demonstrate that far infrared helps enhance circulation in the skin modulate sleep ease pain protect against oxidative stress and relieve inflammation.
For example astronomers sometimes define far infrared as wavelengths between 25 μm and 350 μm.
Infrared ir sometimes called infrared light is electromagnetic radiation emr with wavelengths longer than those of visible light.
It is therefore generally invisible to the human eye although ir at wavelengths up to 1050 nanometers nm s from specially pulsed lasers can be seen by humans under certain conditions.
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Far infrared rays are invisible waves of energy that have the ability to penetrate all layers of the human physical body penetrating into the inner most regions of the tissues muscles and bone.
An ancient technique far infrared therapy uses these waves or rays of energy to slightly elevate the surface temperature of the body.
The long wave side of the fir spectrum overlaps with so named terahertz radiation.
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