Far infrared gets into the 130-140F range but the main sweat inducing mechanism is through the infrared itself. Should get 40-60 min without (huge) distress. It penetrates deep into the body and is (theoretically) more effective at driving out the toxins than normal sweating. Can read, watch videos on your phone, whatever. Mine has a built-in stereo system with speakers.
Near infrared is (generally) less controlled and a bit lower in temp. You are using heat lamps (yes, like for burgers at McD) for crying out loud. Story goes the body has mechanisms that respond well to those wavelengths. Like I typed, for <$100, I`ll do the N=1.
Steam saunas are typically in the 180-190F range. Work with steam, after all. 10-20 min can be tough for the faint-hearted. (Ha! I crack myself up some times. )
Theoretically, following a workout with any of these is extremely beneficial - more so than an ice bath.
Now cold/cryo- stress, that is a whole other thing I am exploring....
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