LED Light Introduction

6月 17, 2018

LED Light Introduction

A light-emitting diode (LED) is a two-lead semiconductor light source that emits light when activated. At present, LED is applied in many industries, including street light, auto light, electric light, display device, etc.

Colors of LED:

Colors of LED includes infrared radiation, red, orange, yellow, green, blue, violet, ultraviolet. The spectrum of natural white light (sunlight) includes every color, so LED can only simulate the color of sunlight. It means the white light LED emits cannot be as same as the natural light.

The principle LED emits white light is through emitting RGB three colors light or transforming spectral color with white fluorescent agent. It stimulates human photoreceptor cells and makes us feel that we see the white light.

Application of LED on automobiles:

LED is applied in the automotive lighting system, including headlight, fog light, stop light and turn signals, dashboard icons, etc.

When LED luminance develops and meets the standard now, producer starts applying LED on turn signals and brake lights. LED can be turned on or turned off in a very short time. The time to turn on LED is 0.5 second faster than incandescent lamps (Halogen lamp is one of incandescent lamps).

LED light is brighter than incandescent lamps during the day. LED light also has other advantages, such as long lifespan, high-speed turning on. It also increases 6 meters brake reacting distance to decrease incidences of accident. It is important for safe driving.

Under vehicle shaking and temperature difference during driving, LED still has stable and reliable luminance. There have been few cars used white LED as headlight now. The light direction control is better than incandescent lamps plus parabolic reflector.

Flashlights for some emergency vehicles are also LED because of its high-speed flash feature and high reliability.