LED flashlight is the LED (light emitting diode) light source for a new flashlight. Because LED with high brightness, low power consumption, long life, small size and other characteristics, it is ideal for portable lighting.
LED light-emitting principle（led flashlight)
There are many atomic electron energy levels, when electrons from high energy to low energy level transition, the electron energy is reduced by a reduction of energy is converted into photon emission out. Large number of these photons is a laser.
LED similar to the principle. The difference is, however, LED is not the atoms within the electron through the jump to light, but by adding the voltage across the LED of the PN junction, so that energy level to form a PN junction itself (in fact, is a series of energy level), and then on the electronic transition of this level and produce photons of light.
New LED display parts have low power consumption, high brightness, long life, small size, etc., this LED display parts from the brief history of the beginning, of a surface mount LED, LED automotive applications and the development of LED lighting trends in the display for the development of the Chinese engineers have some reference value. Of the world’s first commercial light-emitting diode (LED) in 1965 made with germanium materials, and its price is 45 dollars.(200 led flashlight)
In 1968, LED’s have made breakthroughs in research and development, the use of nitrogen-doped GaAsP technology to achieve the efficiency of the device 1 lm / W, and the ability to glow red, orange light and yellow light. By 1971, the industry has introduced with the same efficiency GaP green die LED. 1972, a small number of LED displays for watches and calculators. World’s first LED watch was originally sold in expensive jewelry stores, and its price is as high as 2,100 dollars. Almost at the same time, Hewlett-Packard and Texas Instruments also introduced a 7-segment red LED display with a calculator. 70 to the 20th century, due to LED devices in the home and office equipment in the large number of applications, LED prices plummet. In fact, LED is the main figures of that era and text display.
However, in many commercial devices, LED displays also came from the fierce competition of other display technologies such as LCD, plasma and vacuum fluorescent tube display.
The competitive incentive LED manufacturers to further expand their product type, and is actively seeking a significant competitive advantage LED applications. After LED dot matrix display text began to be used, the background grid pattern with the lights and bar graph arrays. Digital display of the size and complexity continues to increase, from 2 digits to 3 or even 4, from 7 figures to be able to display complex combinations of text and images 14 or 16 array. 1980, manufacturers began to offer intelligent LED dot matrix display. The technological advances that can be used in outdoor sports LED information publishing and automotive center high-mounted stop lamp (CHMSL) equipment. The invention of bright blue LED display advertising to achieve true color possible, so that the display can show true color, full-motion video images.(xenon flashlight)
The emergence of blue LED so that people can use down the line converted the phosphorescent material will be in part the higher energy blue light into other colors. LED light sources are only able to completely cover the CIE chromaticity curve all the saturated colors and a variety of colors and phosphorus of the organic LED can be virtually unlimited integration of any color. In reliability, LED’s half-life (ie, light output is reduced to half the initial value of the time) is about 10,000 to 100,000 hours. In contrast, the half-life incandescent light indicating type (here the half-life refers to the number of lamp failure half the time) is typically ranging from 10 million to thousands of hours, depending on the rated lamp current.