Do you know how many watts is the FIR emission and what microns is the infrared wavelength emitted by your mats?
For amethyst mats it is 3.66 x 102 W/m2 with min 93% efficiency in the wavelength range 5-14 microns; with almost 80% of this energy transferred at two so called “amethyst peaks” at 7 and 12 microns.
For gemstone mats it is 3.72 x 102 W/m2 with min 92% efficiency in the wavelength range 4-20 microns; with around 50% of heating energy transferred at two amethyst peaks at 7 and 12 microns.