Home Therapy: The Ultimate Guide to Natural Healing at Home

Red light sits at the lower end of the visible spectrum of light. The color of light is determined by its wavelength. The upper end of the red light spectrum, where red transitions to orange, is around 620 nanometers (nm). The lower end, where red light transitions to infrared light, is around 700nm. By using “upper” and “lower” here I’m simply equating shorter wavelengths with “upper” and longer wavelengths with “lower.”