“Red light therapy” refers to treatments from LEDs that deliver wavelengths of natural red and near infrared light. Red light therapy does not rely on heat, a major difference between natural light treatments and heat-based modalities like an infrared sauna, traditional sauna, or other type of heat therapy. Red light therapy describes natural light treatments that deliver the same therapeutic red and near infrared wavelengths as natural sunlight. This differs from artificial light treatments like tanning or bright light therapy from a light therapy lamp, light box, or happylight. Red light therapy may also be referred to as the following terms: RLT, photobiomodulation (PBM), phototherapy, LED therapy, LED light therapy, low-level laser therapy or low level light therapy (LLLT).