Infrared transmitter tube is also called infrared emitting diode which is the diode type. It can converts the electricity into near infrared light (non-visible light). - Mainly used in all kinds of photoelectric switches and remote control transmitter circuit. - Physical parameter: transmitting distance emission angle(15' 30' 45' 60' 90' 120' 180') luminous intensity wavelength. - Usually small power infrared transmitting tube diameter: 3mm 5mm forward voltage: 1.1~1.5V current: 20mA; Medium-power and high power infrared transmitting tube diameter: 8mm 10mm medium-power transmitting tube forward voltage: 1.1~1.5V current: 20mA; High power transmitting tube forward voltage: 1.5~1.9V current: 350mA.