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Disadvantages of Using LEDs

Author£ºAdmin Hit£º256 Time£º2010/3/25 2:22:19

LEDs are currently more expensive, price per lumen, on an initial capital cost basis, than more conventional lighting technologies. The additional expense partially stems from the relatively low lumen output and the drive circuitry and power supplies needed. However, when considering the total cost of ownership (including energy and maintenance costs), LEDs far surpass incandescent or halogen sources and begin to threaten compact fluorescent lamps.
LED performance largely depends on the ambient temperature of the operating environment. "Driving" a LED "hard" in high ambient temperatures may result in overheating of the LED package, eventually leading to device failure. Adequate heat-sinking is required to maintain long life. This is especially important when considering automotive, medical, and military applications where the device must operate over a large range of temperatures, and are required to have a low failure rate.
LEDs must be supplied with the correct current. This can involve shunt resistors or regulated power supplies.
LEDs typically cast light in one direction at a narrow angle compared to an incandescent or fluorescent lamp of the same lumen level.
The spectrum of some white LEDs differs significantly from a black-body radiator, such as the sun or an incandescent light. The spike at 460 nm and dip at 500 nm can cause the color of objects to be perceived differently under LED illumination than other light sources.
LEDs cannot be used in applications that need a sharply directive and collimated beam of light. LEDs are not capable of providing directivity below a few degrees. In such cases LASERs (or LED lasers) may be a better option.

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