What is LED and How to recognize LED ？ - 100131

What is LED and How to recognize LED ？

English light emitting diode LED (light emitting diode) acronym, its basic structure is a piece of light emitting semiconductor, silver or white glue curing to the brackets, and then welded with silver, and sealed with epoxy resin and the four weeks, play a role in protecting internal wires, so seismic performance of LED.

LED Principle:

LED (Light Emitting Diode), light emitting diode, is a solid state semiconductor devices of electric energy translated into visible light, which can directly convert electricity to light. Heart of the LED is a semiconductor chip, the chip on a bracket attached to one end of one end is negative and the other end to connect the power of positive, making the entire wafer is epoxy encapsulated. Semiconductor chip is composed of two parts, the part of the p-type semiconductor, prevail in it inside the hole, and the other end is an n-type semiconductor, here is primarily electronic. But when I connect the two semiconductor, a p-n junction is formed between them. When electricity flows through a wire in the chip when the electron is pulled into a p-region, in p-electrons with holes in the compound and will be issued in the form of photon energy, and this is the LED light emitting principle. And the wavelength of the light is the colour of the light, is determined by the material forming a p-n junction.

Initially LED as the light source for instrumentation, then all kinds of light and color of LED traffic signals and has been widely applied in large-area displays, producing good economic and social benefits. With 12-inch red traffic lights, for example, in the United States is the use of long-life, low luminous efficiency of a 140-watt incandescent lamp as a light source, it has 2000 lumens of white light. After the red filter, light loss 90%, leaving only 200 lumens of lights. In the light of new design, Lumileds Corporation 18 red LED light sources are used, including circuit, loss, total power consumption 14 w, can produce the same luminous efficiency. Car lights are also important areas of application of LED light source.

For general lighting purposes, people need a white light source. 1998 white light LED development succeed. This LED GaN chip and yttrium aluminium Garnet (YAG) packaged together to make. GaN chip blue (Ã? p=465nm,Wd=30nm), made of sintered Ce3+ YAG Phosphor by this Blu-ray activated yellow light, m peak 550nLED lamp. Blue LED mounted on the Bowl-shaped mirrored cavity of the substrate, and either covered with resin mixed with YAG thin-layer, CA 200-500nm. Blu-ray parts are issued by phosphor LED substrate absorption and partly mixed with phosphors emit yellow light blue light, white light can be obtained. InGaN/YAG white LED, by changing the chemical composition of YAG phosphor and adjusting phosphor layer thickness, you can get color temperature 3500-10000K colors of white light. This blue light LED white light way, simplicity, low cost, high technology is mature, therefore the use of the most.

LED Features :

1, energy saving. White LED energy consumption only for the one-tenth of incandescent, energy-saving lamps one-fourth.

2 and longevity. Life of up to 100,000 hours for ordinary home lighting can be described as "once and for all."

3, can work at high speeds. energy-saving lamps if filament will be blackened for startup or shutdown of frequently broken quickly.

4, solid-state package belongs to the cold light source types. So it's very easy to transport and install, devices which can be installed in any small and closed, not afraid of vibrations, almost regardless of the heat sink.

5, led technology is changing in progress, the luminous efficiency of its impressive breakthroughs being made, the price has been reduced. A white-light LED into the home is rapidly coming of age.

6, environmental protection, no harmful substances mercury. LED bulb Assembly parts can be easily dismounted without the manufacturers recycling can be reclaimed by others.

7, with light technique makes LED lights extension for surface light source, increasing beam to eliminate glare and sublime visuals and eliminate eye strain;

8, lens and Lampshade design. Both of the condenser and the protective role of the lens, to avoid wasteful duplication of light and makes the product more compact appearance;

9 plane, high-power led cluster packages, and radiator integrated with lamp holder design. Fully protect led cooling requirements and service life, essentially satisfies the structure and styling of arbitrary design LED lamps, very distinctive feature of LED lamps.

10, energy conservation significantly. Using super bright high power LED light source, combined with efficient power supply,saving more than 80% than traditional incandescent lamp, the same power 10 times times the brightness of incandescent lamps;

11, long life of 50,000 hours or more, more than 50 times times is a traditional incandescent light. LED uses advanced packaging technology-eutectic solder, fully guarantee the long life of LED;

12, no flicker. Pure DC works, Visual fatigue due to eliminate traditional light strobe

13, green environmental protection. Does not contain lead, mercury and other pollution elements, there is no pollution to the environment;

14, shock-resistant, anti-Thunder power, no ultraviolet (UV) and infrared (IR) radiation. No filament and glass enclosure, no traditional tube fragmentation problem, no harm to human body, no radiation.

15, work under low voltage, safe and reliable. Surface temperature 60 c (ambient temperature Ta=25 );

16, wide voltage range, world wide LED lights. 85V~ 264VAC voltage range constant current to ensure longevity and brightness is not affected by voltage fluctuations;

17 the PWM constant current technology, high efficiency, low heat, constant flow of high precision;

18, reduce line losses, pollution-free. Power factor 0.9, harmonic distortion 20%,EMI in line with global targets,reducing the power loss of the power supply line and avoid the pollution of high frequency interference on the power grid;

19, standard lamp, you can directly replace the existing halogen lamps, incandescent lamps, fluorescent lamps;

20, the luminous efficiency of up to 801m/w, a variety of LED light colour temperature can be selected, high color rendering index, good color rendering;It is clear that as long as the LED lights with led technology continues to improve, while lowering the cost. Energy-saving lamps and incandescent lamps will be replaced by LED lamps. Countries are giving increasing attention to issues of lighting energy-saving and environmental protection, has been used in promoting LED lighting.

The Advantages and disadvantages of LED Product:

Cooling problem, if the heat sink will significantly shorten the life of the poor.Low-end power saving LED lights is still lower than energy saving lamps (cold-cathode tubes, CCFL).Initial purchase cost is higher.Directional strong LED light source, lighting design-LED special optical properties need to be considered.

For the neon and LED lights, join the latest LED technology, not before you see that information in the network.

1. LED lights have 100,000 hours of life?

Lumen 7%, actually, only about 50,000 hours. Lumen 3%, 80,000 hours of practical application.

2. LED not to heat it?

Will need cooling.

3. the LED could replace incandescent bulbs yet?

Luminous flux, light effects and color rendering properties can be, but it is too expensive and will not decline in recent years. But you can improve the product's luminous flux and thus reduce the costs of replacing incandescent lamps.

4. LED spot light source can be made simply using it?

No, power supply, optical LED lights and heat conduction combined with.

5. two kinds of light source performance advantages and comparison

NEON's strengths has been covered by LED, LED lamp too high.

6. the two sources of power supply

LED low pressure well, but contains too much electricity. Large specimens of 1 watt LED single lamp input current at 350mA.

7. the control techniques comparison of two kinds of light sources ,LED is easy to achieve, but neon mature.

8. the stability of two kinds of light sources

Inconsistency of LED, neon lights are quite stable. Few manufacturers can achieve relative stability, such as combination of AOD by CREE chip, take advantages of each chip.

9. price comparison of two kinds of light sources

LED is more expensive, but is quite yellow and Red mainly expensive LED is white.

10. two light outdoor use:LED lights can be totally waterproof and dustproof.

11. the comparison of two kinds of source markets:Global lighting products, annual production value of US $ 42 billion (15 billion dollars) LED light sources are less than 1%.

Application of LED Products:

Initially LED as the light source for instrumentation, then all kinds of light and color of LED traffic signals and has been widely applied in large-area displays, producing good economic and social benefits. With 12-inch red traffic lights, for example, in the United States is the use of long-life, low luminous efficiency of a 140-watt incandescent light bulb as the light source,It has 2000 lumens of white light. After the red filter, light loss 90%, leaving only 200 lumens of lights. In the light of new design, Lumileds Corporation 18 red LED light sources are used, including circuit, loss, total power consumption 14 w, can produce the same luminous efficiency.

Car lights are also important areas of application of LED light source. In 1987, China began installing high mounted stop lamp on the car, due to the fast LED response (nanosecond) and the drivers know in advance so that the vehicles operating conditions, and reduce the incidence of rear-end accidents.

In addition, the LED lighting in the outdoor full color led display red, green and blue, key chain mini flashlight and other fields has been applied.

What the type of LED Products?

Indoor lighting and outdoor lighting LED lighting fixtures can be divided into two parts. Market Shang common of LED lighting lamps type main has following several products type: LED high-power module module Street, and LED shot lamp, and LED lamp Cup,and LED lampholders, and LED lamp, and LED lamp with, and LED lamp, and LED lamps, and LED lamp article, and LED soft lamp article, and LED lamp series, and LED bulb, and LED lamp beads, and LED Wick, and LED chip, and LED tube lamp, and LED candles lamp, and LED stars lamp, and LED Induction lamp, and small power LED lamp, and High-power LED lamp, and high-power LED energy lamp, and LED meteor shower lamp, and LED air vitamin purification lamp, and LED voice-activated lamp, and LED flat lamp, and LED touch lamp, and LED semiconductor lighting, and LED high-power days lantern, and LED explosion-proof lamp, and LED tube,and LED explosion-proof anti-corrosion dust lamp, and LED solid from maintenance explosion-proof lamp, and LED fluorescent locomotive explosion-proof platform lights, LED lights, LED tunnel lights, other classification of LED products.