LED of various light colors was widely used in traffic signal lights and large-area display screens, which produced good economic and social benefits. The 12-inch red traffic light, for example, was originally used in the United States as a long-life, low-light-efficiency 140-watt incandescent light source, which produces 2,000 lumens of white light. After passing through the red filter, 90% of the light is lost, leaving only 200 lumens of red light. For general lighting, people need white light source more. In 1989, the white LED was developed successfully. This LED is made of GaN chip and yttrium aluminum garnet (YAG) encapsulated together. GaN chips emit blue light (λ P =465nm, WD =30nm), and the Ce3+ containing YAG phosphor made by sintering at high temperature is excited by the blue light and emits yellow light with a peak value of 550nm.

5611BB LED 5611BB 16-segment 5611AB display 5611AB

LED wavelength, the intensity of the light changes, can be described by data called wavelength. The wavelengths of light we can see range from 380 to 780nm. Unit: nanometer. Brightness, brightness refers to the degree of brightness of an object, defined as the intensity of light per unit area. Unit, NIT. LED light intensity refers to the brightness of the light source. That is, the physical quantity of the visible light radiation emitted by the light source in a certain direction and range.

Common-Cathode CC 8016AG 7-Segment digit 8016AG LED Common-Anode CA 8016BG Display 8016BG 0.80 inch
Common-Cathode CC 8011AG 7-Segment digit 8011AG LED Common-Anode CA 8011BG Display 8011BG 0.80 inch

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