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A bit about LED Lighting...
  1. What is an LED?
  2. Can LEDs be used to replace conventional incandescent and florescent light bulbs?
  3. What are the advantages of LEDs compared with conventional incandescent lights?
  4. What are the disadvantages of LEDs compared with incandescent or florescent bulbs?
  5.  How do the LED light strings and incandescent light strings in terms of reliability?
  6. Why are LEDs of some colors are more expensive than LEDs of other colors?
  1. What is an LED?
     A light emitting diode (LED) is a semiconductor device that emits visible light when electrical current passes through it, it is a special kind of diode.

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  2. Can LEDs be used to replace conventional incandescent and florescent light bulbs?
    Yes and no. LEDs have increasingly been used in many different applications to replace old incandescent light bulbs. Examples include LED indicator lights for all kinds of electronic devices such as cellphone, calculators, automotive dash panel, LCD back-lighting, etc., LED seasonal decoration lights for Christmas and holidays, LED traffic signs and other LED direction signs, LED flashing lights, etc. Currently LEDs have limited brightness, but this is increasing as better technologies are developed to make it brighter.

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  3. What are the advantages of LEDs compared with conventional incandescent lights?
    There are many advantages that LEDs have over traditional incandescent light bulbs: · Low power consumption: Saves you money and energy! · Long lasting · Cold lighting · Ruggedness · Small size and weight · Simple to use More detailed explanation about the advantages of LED lights: LEDs are more energy efficient than incandescent bulbs. You can save money & energy by using LEDs instead of equivalent incandescent decorative bulbs. The rated average working life of LED is 100,000 hours compared with 1,000 hours of incandescent bulbs. LEDs emit cold lights as working LEDs generate very small amount of heat, so LEDs are much safer than equivalent incandescent light bulbs in terms of danger of fire. LEDs don’t have filaments to heat up in order to emit lights like incandescent bulbs. Lights are emitted from LEDs as a result of energy exchange occurring in the different semiconductor materials an LED is made of. LEDs are usually shielded with solid transparent plastic materials so they are more rugged than incandescent and florescent bulbs that are usually sealed with glass. LEDs can be powered by either AC voltage or DC voltage. The circuit that is required to appropriately drive LEDs is much simpler than that for florescent bulbs.

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  4. What are the disadvantages of LEDs compared with incandescent or florescent bulbs?
    LEDs emit limited amount of lights at a relatively small angle range, while incandescent and florescent light bulbs illuminate in all directions. LEDs are more expensive than equivalent incandescent light bulbs. This is why some customers still hesitate to buy LED products even though LEDs have so many obvious advantages over incandescent bulbs and people actually can save money by using LED products in the long run.

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  5.  How do the LED light strings and incandescent light strings in terms of reliability?
     LEDs are more reliable. However, in the case of light burning, an incandescent light bulb will always burn open, namely, the filament of the incandescent bulb breaks, so the whole string will always fail, while an LED light may either burn open like an incandescent light bulb or burn short where a short circuit is formed inside the LED, so the burned out LED will stop lighting, but all the rest LEDs in the string still light normally. And LEDs usually burn short, therefore, LEDs are more reliable than incandescent light bulbs.

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  6. Why are LEDs of some colors are more expensive than LEDs of other colors?
    Different semiconductor materials are used for different color LEDs, and some semiconductor materials are more expensive than others. Also manufacturing costs are different for different colors. For example: White LEDs are the most expensive because red, green and blue LEDs are combined together to make a white LED.

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