That dual approach sets the Eclipse line apart from most infrared saunas on the market, which typically rely on infrared heat alone. Sun Home Eclipse TourHow full-spectrum infrared heating worksUnlike traditional saunas that heat the air around you, infrared saunas use electromagnetic radiation to warm the body directly. Far-infrared wavelengths produce the most thermal energy and are the most studied in the context of sauna therapy. A separate systematic review and meta-analysis of seven studies involving 491 heart failure patients found that infrared sauna therapy was associated with short-term improvements in cardiac function. What the red light therapy panels doThe more distinctive feature of the Eclipse line is its integrated red light therapy panels, which deliver wavelengths in the 630 to 850 nanometer range.