Sooooo..... I have a Far infrared (FIR) sauna. It has large flat 'carbon' panel heaters. They get warm to the touch and won't burn you if you touch them. My non contact infrared thermometer zapper says that they get to about 70 degrees C. They are meant to be producing lots of FIR. A regular mechanical dial thermometer at the top of the sauna (above the panels) shows that the temperature up there (after about 20 minutes of the sauna warming up) peaks at about 50 degrees C. I am assuming that while the direct radiant energy of the panels is FIR that is also striking the wood interiour of the sauna, heating it, and the wood in turn, is releasing / emitting IR, somewhere else on the spectrum. The FIR is 'said' to penetrate the body and warm you up producing an intense sweat even though the temperature of the room stays lower at only 50-60 deg C, as opposed to a conventional Finnish style sauna that heats up to 80-90 degrees with many people unable to handle the heat and sit comfortably for very long. I say yes it does make you sweat, whether this is because of the FIR, or because you are sitting in a box at 50 degrees, I can't say.I don't really see why the other parts of the IR spectrum would not penetrate you as well. My sauna wasn't 'feeling' hot enough for my liking so I retro-fitted a couple of conventional bar heaters (the old kind of glowing red, long quartz glass tube, with a tungsten filament inside). Now these make the sauna (or rather me!) feel a whole lot hotter, but they don't move the dial thermometer that much. They glow and are said to produce more near infra red (NIR). Obviously the bulbs are very hot (100's of degrees) and produce a lot of IR/heat, which decreases the further you get from them. Please, whats the right way to go about measuring the temperature at the position where I am sitting in the sauna with the NIR falling upon me?