A full-spectrum infrared sauna uses emitters covering near, mid and far infrared rather than far infrared alone. Manufacturers describe the shorter wavelengths as penetrating differently, but the split between bands and the output of each is rarely published, so two cabins both labelled full spectrum can differ substantially.
Why it matters when you are comparing products
Full spectrum is a marketing category more than a specification. Without published output per band, it tells you little that emitter count and cabin size do not.
Where this comes up
- Which sauna specifications actually matter? — Which published fields are worth comparing and which are noise.
Reviewed 2026-08-15