Far infrared sauna technology produces radiant heat. Radiant heat warms a molecule directly. In a properly calibrated far infrared heater of 9.4 microns, the light will act directly on your cells exciting them with vibration and energy to more efficiently carry out cellular functioning to an optimal level of homeostasis. In fact, a bandwidth of 9.4 microns of far infrared light is the exact output of far infrared light the human body produces in the form of body heat. Far infrared light emissions measured at 9.4 microns are called biophotons.