LED KNOWLEDGE
This page shows some information on the frequently asked questions of LEDs and our LED light bulbs. We hope this page will help you to learn more about LEDs and our products. You are welcome to browse therm. Any other questions, pls don't hesistate to contact us.
1. Question:What is a LED? 
Answer: A light emitting diode (LED) is a semiconductor device that emits visible light when electrical current passes throuth it, it is a special kind of diode.
2. Question:How does LED work?
Answer: They don't have a filament that will burn out, and they don't get especially hot. They are illuminated solely by the movement of electrons in a semiconductor material, and they last just as long as a standard transistor.
3. Question:Can LEDs be used to replace conventional incandescent and florescent light bulbs?
Answer: LEDs have been used in many different applications to replace old incandescent light bulbs, firstly in the fields of LED indicatior lights for all kinds of electronic devices such as cell phone, calculators, automotive dash panel, LED flashing lights, and so on. Now as the developement of brightness of LEDs, they can be used to replace incandescent and florescent light bulbs for general lighting purpose.
4. Question: Why are LEDs different colors?
Answer: The color of an LED is a function of the material used to make the junction. There are two main flavors used in visible light LED junctions: Indium gallium nitride (InGaN) is used to make up the blue, white, true green, and UV types. Aluminum gallium indium phosphide (AlGaInP or AlInGaP) is used to make the red, yellow, and orange types. The type of material used also has an effect on the rated forward voltage of the LED. It's useful to think of these two different types of diodes even if you can't remember the exact material—the red, yellow, and orange types have a forward voltage around 2 Volts, while the blue, white, and true green types have a forward voltage around 3.3 Volts.
5. Question: How do they make white LED light?
Answer: There's two main ways to get white light from LEDs: The first method is to combine light from red, green, and blue colored LEDs. If you get the right mix, the effect is white light. This is the same way your television works—a white object on the screen is really depicted using dots of red, green and blue lit up in proportions that form an impression of white. White formed this way can be "tuned" to look warm or cool by adjusting the amounts of colors in the mix. The second method uses a blue LED with a phosphor coating. The coating emits a yellow light when the blue light from the LED shines on it. The mix of the yellow light with the blue light forms a white light. Inefficiency in the phosphor conversion is one reason that a white LED is less efficient overall than a colored LED. Some of the light energy is lost in the conversion to yellow.
6. Question: What is the adventage of LED lighting?
Answer: A.Long life – lifetimes can exceed 100,000 hours, as compared to 1,000 hours for tungsten bulbs
B.Robustness – no moving parts, no glass
C.Size – typical package is only 5 mm in diameter
D.Energy efficiency – up to 90% less energy used translates into smaller power supply required
E.Non-toxicity – no mercury
F.Versatility – available in a variety of colors
G.Cool – less heat radiation than HID or incandescent
Light Emitting Diodes (LED's) have many advantages compared to incandescent lamps. They are much more rugged mechanically, since there is no filament to break or burn out, LED's typically last many times longer than incandescent lamps of similar size and brightness. They are very energy efficient and typically require only 10 to 20 percent of the power required by incandescent lamps of similar brightness.
The use of LED lighting is expanding rapidly for a number of reasons, although the upfront cost per unit of LEDs versus traditional light bulbs is higher, the maintenance and operating costs of LED lighting is usually much lower.
LED lighting pays dividends after the installation because time and labor is no longer required for changing light bulbs, and money is saved from the reduced amount of electricity used for lighting.
Lighting technology has changed to such an extent that traditional incandescent lights are no longer the most practical for almost any type of lighting, not even from a cost prospective, Energy-efficient Fluorescent and Compact-Fluorescent lights are the best alternative for most wide-area lighting applications while LED lighting has taken first place in almost all other applications. Other than being very energy efficient, LED lighting works very well for dimming and provides outstanding results in colored lighting and accent lighting, delivering truer and more brilliant colors than any less-efficient lighting methods do.
Other Benefits
The other benefits of LEDs include:
+ Lights instantly
+ Can be easily dimmed
+ Silent operation
+ Low-voltage power supply (increased safety)
