Red light refers to the light wave in sunlight with a wavelength of 600~700nm that can cause the human retina to sense red.

650nm red light

The 650nm band red light penetrates deeply into the human body and is effective. It has the advantages of large light spot, uniform illumination, and no burns.

650nm red light

Red light with a wavelength of 650nm stimulates the body to produce natural melatonin, regulates the body's biological clock, and effectively improves sleep quality.