What is the wavelength of the infrared tube?

There are three bands of infrared emission tubes commonly used in LED packaging industry, which are 850NM, 875NM and 940NM respectively. According to the characteristics of wavelength, the products used are also very different. 850NM wavelength is mainly used for infrared monitoring equipment, 875NM is mainly used for medical equipment, and 940NM band is mainly used for infrared control equipment. For example: infrared remote controller, photoelectric switch, photoelectric counting equipment, etc.