Got this from the same site:
"In conclusion, we much prefer the near infrared design, although in fairness, both types are truly wonderful healing devices fit hey are well-designed and the bather understands how to use them. Perhaps this helps to explain why our feedback is that the near infrared lamp sauna is a far more effective design."
I'm in the process of building a unit I can use in the small bathroom I have downstairs. I purchased the far-infrared bulbs from Lowes along with all the other supplies. I might get a set of the near-infrared bulbs and just rotate between the two.
I'll post a picture of what I built as soon as my drill charges up so I can drill four holes to mount the bulbs. I kind of followed a do-it-yourself that was on Mercola.com.