Advantages and Weaknesses of LED Application | LEDinside – LED, LED Lighting, LED Price Trends, Global LED News and Market Research
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`Home > Tech Column > Advantages and Weaknesses of LED Application
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`Advantages and Weaknesses of LED Application
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`December.20, 2007 - 17:51 — Kerry Ko
`
`Unlike conventional incandescent lamps which need to convert the electricity into thermal energy first and then to light, LED illumination is
`achieved when a semiconductor crystal is activated so that it directly produces visible light in a desired wavelength range. With the
`continuous development of lighting technologies, more possible future applications of LEDs will be seen. Advantages and disadvantages of
`using LEDs are to be discussed as follows.
`
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`Advantages of LEDs
`
`1. Long Lifespan
`The lifetime of conventional incandescent lamps is usually 3,000~4,000 hours. The ETTF (Estimated Time To Failure) of a LED is as long
`as 100,000 hours, which is much longer than that of incandescent lamps. Suppose we let a LED work four hours a day, we may have it
`work for us for more than 60 years.
`
`2. Energy Saving and Low Cost
`Generally speaking, LEDs are designed to operate with only 12~24V, and LEDs produce more light per watt than incandescent bulbs. High
`efficacy with low voltage makes it easy for LEDs to gain an edge up from conventional incandescent lamps, consuming 80% less electrical
`power. Although currently High-Brightness single-color LEDs are more expensive than conventional incandescent lamps, they save much
`more electrical power, which can offset the price gap. Suppose a LED requires 15W to reach a certain luminance, it would take up to 150W
`for a conventional incandescent lamp to reach the same level of luminance.
`
`3. More Environmentally Friendly
`Unlike incandescent bulbs and fluorescent lamps, LEDs emit light in a different way. LEDs do not rely on a filaments that will burn out,
`become heated, or disperse toxic gas. As a solid state component, LEDs are better able to withstand eternal shock. The illumination is
`generated solely by the movement of electrons in a semiconductor material, and its lifespan is similar to that of a standard transistor.
`
`4. Environmental Adaptability
`LEDs operate well in a wide range of temperatures, -40℃~+85℃, with the humidity below 65%. Therefore, LEDs can be used in a
`relatively harsh environment.
`
`5. A Variety of Applications
`LEDs have advanced from its use in numeric displays and indicator lights to a range of new and potential applications, including
`architectural lights, exit signs, accent lights, task lights, traffic lights, signage, cove lighting, wall sconces, outdoor lighting and down lighting,
`etc.
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`Weaknesses of LEDs
`
`1. Bad Color Revivification
`The general color rendering index of LEDs has been relatively low in the past, and the color reversion of LEDs is does not compare to that
`of incandescent bulbs. We all know that the lighting quality of incandescent lamps is excellent (CRI 100%) while white LEDs provide color
`rendering indices between 70% and 85%, better for daylight (6,000 K) than for warm white (2,900 K) LEDs. However, with the improvement
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`Advantages and Weaknesses of LED Application | LEDinside – LED, LED Lighting, LED Price Trends, Global LED News and Market Research
`
`of phosphors and the technological upgrade of LED materials, some LEDs’ CRI has been enhanced to 90%.
`
`2. Single LED’s Power is still Low
`Due to the low power of a single LED, its luminance remains fairly low. Thus, more LEDs are required to be connected in parallel, such as
`in automobile backlights. More LEDs lead to higher cost, although the cost of a single LED is not high. At present, a single high-power LED
`is quite expensive yet its luminous intensity is just around 5,000 mcd.
`
`3. Short Illumination Range
`Although many methods have been developed to improve the brightness of the LED light source, it remains difficult to extend its
`illumination range. As LEDs emit scattered light, the illumination range is only tens of meters. Thus, LEDs are quite suitable for short-range
`lighting application. Nevertheless, with the development of new technology, LED’s illumination range is expected to expand gradually.
`
`4. “Yellow Ring” Phenomenon
`Due to the immature process of white light LEDs and the error when configure the reflective cup and lens, “Yellow Rings” that frequently
`appear in white light LEDs are difficult to eliminate. In recent years, blended phosphor has been adopted to generate ideal white light with
`high CRI.
`Take the blue light LED for example, it activates the mixture of YAG phosphor and green or red phosphor to generate white light. If the blue
`light LED, after activating YAG phosphor, emits white light with a “yellow ring”, green light (wavelength 500nm～530nm) phosphor may be
`added to counteract the unwanted yellow light. Similarly, if the blue light LED, after activating YAG phosphor, emits white light with a “blue
`ring”, red light phosphor without sulfide may be added to counteract the unwanted blue light. These methods can regulate not only the color
`coordinates but also the color temperature of LEDs, without affecting the lifespan of the LEDs.
`
`5. Heat Dissipation
`Heat generated by the acting light emitting chip for the LED must be absorbed to maintain normal working temperature to prevent over-
`heating or damaging the chip. Industry players strive to develop more efficient heat-dissipating materials.
`
`Although LEDs bear several imperfections which need to be improved in the future, they possess many advantages over conventional
`incandescent lamps. As a next-generation light source, offering benefits such as its compact size, long lifespan, energy-efficiency, and
`durability, LEDs have aroused tremendous interest among different countries and regions. With the rapid advancement of LED industry all
`over the world, we believe that these imperfections of LEDs will be corrected in the foreseeable future.
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`https://web.archive.org/web/20121102080414/https://www.ledinside.com/knowledge/2007/12/Advantages_and_weaknesses_of_LED_Application_200712[1/27/2021 7:07:24 AM]
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