660nm Deep Red is the most widely researched wavelength for surface-level photobiomodulation. It is absorbed by mitochondria in skin and superficial tissue cells, stimulating collagen production, accelerating wound healing, reducing inflammation, and supporting acne and skin repair. It is the wavelength responsible for most visible skin improvements from red light therapy. 850nm Near-Infrared is invisible to the naked eye and penetrates significantly deeper — into muscle, joint, bone, and nerve tissue. It drives deep tissue repair, reduces chronic inflammation, supports muscle recovery after exercise, and is the wavelength behind most pain relief and recovery benefits attributed to red light therapy. The Leredd RLT Lamp allows you to use 660nm alone or both wavelengths combined in the same session.