What is an LED?
The LED (light-emitting diode) is a design that emits light when an electric passes through the device. This phenomenon, called electroluminescence in which come out a cold light, it is emitted as a result of mixed chemistry. Whereas LED is different from incandescent bulb, in which light is as a result of heat. Through kinds of semiconductor materials, LED can be emitted as variety of light colors. There are infrared, visible and ultraviolet light.
What is LED lighting?
LED lighting is called Solid State Lighting (SSL), its light source is LED, it is different from incandescent or HID light; compared to traditional incandescent bulb or fluorescent light, LED lighting is less heat and energy loss. Besides, it provides better anti-shock, vibration and durable. Therefore, lifespan could be increased significantly. United States Department of Energy announces the LED lighting is an important and foreseeable energy technology in coming future.
What are the advantages of LED?
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Energy saving – LED is 10 to 50 times more energy efficient than incandescent light bulb and reduces operating costs up to 90%。
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Long lifespan – incandescent light products are only rated up to 3,000 hours whereas LED luminaries is last life time up to 100,000 hours; it could last life time more than 10 years even continually use.
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Safety – Low power consumption, low operating temperature and low heat output in which enables dangerous free even touching under LED lighting in operation because of LED cold temperature character.
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Durability –LED is SSL, so it is more durable than conventional bulbs and it is more resistant in breakage, crack, vibration, shock and temperature change violently.
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Small size – High intensity, low weight and small size that let designer in planning is more flexible.
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Instant response – No flicker, No delay in lighting on.
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Superior light source – Minor ultraviolet or infrared radiation.
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Flexible design – Compared to traditional lighting devices, the aesthetic design of LED luminaries are much more unlimited.
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Modulization – Plug & Play concept design.
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Special application – LED can be implemented as pulsed or flashed light source.
Are there any disadvantages of LED?
Yes, there are some disadvantages of using LED.：
- Price is high - LED is currently more expensive than conventional lighting technologies. This is partly due to the relatively low lumen output of LED. However, since LED technology keeps improving and the energy expense sharply increases, we can still save money by using LED luminaries in the long run.
- Thermal dissipation issue – it is the most relevant to the lifespan of LED. These years, fin, fan or heat sink base are widely used to dissipate the heat. However, there are a lot of limits in thermal dissipation for high-power LED lighting applications. One of companies, ATD implemented an innovative LHP thermal technology for LED lighting. According to the 3 years field test, LHP solution has been proved that it should be the best heat dissipation technology which keeps the junction temperature lower than 65℃.
What is High Power LED?
LED which consumes over 1W is called high power LED. The key factor is the special structure, which ensures very low thermal resistance between the chip and the circuit board. They are usually used on metal core circuit boards and require special thermal management. High power LED is a new class of light sources which could apply to industrial, scientific, medical, and consumer those applications.
What does Lumen (Lm) mean？
The lumen (Lm) is a measure of the perceived power of light. The lumen is defined in relation to the candela by1 Lm = 1 cd•sr = 1 Lux•m2. The lumen stays unchangeable light output under different distances.
What does Lux mean？
The Lux is used in photometry as a measure of the intensity of light. One Lux is equal to one lumen per square meter.
What does color temperature mean？
The color temperature of a light source is determined by comparing its chromaticity with that of an ideal black-body radiator. The temperature (usually measured in kelvin (K)) at which the heated black-body radiator matches the color of the light source is that source's color temperature. Color temperature in the range of 3000–6000 K is recommended for most general indoor and task lighting. Higher Kelvin temperatures (> 6000 K) are considered cool and lower color temperatures (< 3300 K) are considered warm.
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