An infrared sauna is a type of sauna that uses light to create heat. These saunas are sometimes called far-infrared saunas where "far" describes where the infrared waves fall on the light spectrum. In contrast, a traditional sauna uses heat (180 - 190 degrees) to warm the air, which in turn warms your body.
Infrared saunas produce a milder temperature of 120-150 degrees however since the heat in an infrared sauna is like the sun, the heat travels deep into the body and can cause sweat at this lower temperature. Infrared saunas emit a specific wavelength of light which is absorbed into the skin causing your body`s temperature to rise.
The appeal of saunas in general is that they cause reactions, such as vigorous sweating and increased heart rate, similar to those elicited by moderate exercise
An infrared sauna produces these results at lower temperatures than does a traditional sauna, which makes it accessible to people who can't tolerate the heat of a traditIonal sauna.
So if you're considering trying a sauna for relaxation, an infrared sauna might be the right option.