Full Spectrum Saunas are Farinfrared saunas that also have Near Infrared rays. Clearlight and Vital Sauna both use a Halogen Red Light type of heater to produce Near Infrared Rays in addition to their Carbon or Carbon/Ceramic Panel heaters. The near infrared red light heaters require a lot more energy to use them and the larger saunas require 240V to run the Full Spectrum models.
Therasauna uses a solid Ceramic heater that is a Full Spectrum heater that produces Near, Mid and Farinfrared waves. The Therasauna heaters are patented and unique because they just have one type of heater and the heaters have 96 percent radiant efficiency rating that is patented as the Stableheat System that allows for constant infrared at the desired 9.4 micron level. Therasaunas require less electricity than other Full Spectrum Saunas and only need 120v even for the large 4 person sauna because the watts range from 1141 for the 2 Person, 1531 watts for the 2 Person Plus, and 2016 watts for the 4 Person or Corner sauna.
Clearlights Near Infrared heaters in the Sanctuary Line require 500 watts per heater and are 20 times more powerful. The Sanctuary I person uses 1750 watts, the II person 2250 watts, III person 2800 watts. The larger saunas require 240 V The Yoga Sauna 3360 watts and the Corner Unit 3320 watts.
Near Infrared typically will have a higher micron level close to the 9.4 level that is optimum for the body while many Farinfrared saunas only go to about 6.3 microns.