Do you know the wattage or wavelength of the FIR emitted by your mats?
For amethyst mats, it is 3.66 x 102 W/m2 with a minimum of 93% efficiency in the wavelength range of 5-14 microns, the range best utilized by the human body; with almost 80% of this energy transferred at two “amethyst peaks” at 7 and 12 microns.
For mixed gemstone and amethyst-tourmaline V-mats, it is around 3.7 x 102 W/m2 with a minimum of 93% efficiency in a wider range of 4-20 microns around 50% of heating energy transferred at two amethyst peaks at 7 and 12 microns.