The color (wavelength) of an LED (light emitting diode) that emits light is determined by the material that is made up of semiconductor elements that apply a mechanism which converts electric current into light. We deal in LEDs in a wide range of colors (wavelengths) such as ultraviolet rays, visible light, and infrared rays. LEDs are characterized by their long service life and low power consumption, and are used in applications such as sensing and lighting in combination with light receiving elements.