20 February 2018

Advantages and disadvantages of LED

The term LED full form stands for a light-emitting diode is used in suited for short-range narrow and medium bandwidth links. LED can be suitable for the digital system technology up to 140 Mb / sec. Here this post gives information about the advantages and disadvantages to know more about LED.

Advantages of LED :

  • LEDs produce more light per watt
  • LED is more efficient 
  • Lower initial cost
  • Simple design
  • LED doesn't change their light tint as the current passing through them is lower 
  • Ease of manufacture
  • Simpler fabrication 
  • Simple drive circuitry
  • Simple system integration
  • Linear light output against current characteristics.
  • High reliability
  • Less temperature dependent
  • LED will achieve full brightness in few microseconds
  • LED does not contain mercury, unlike compact fluorescent lamps
  • Excellent CRI ( Color rendering index )
  • Environmental friendly
  • Quick turn ON and OFF
  • Good adaptability to coherent laser operation
  • No warm-up period 
  • Not affected by cold temperature 

Disadvantages of LED :

  • Refraction of light at semiconductor/air interface
  • The average lifetime of radiative recombination is only a few nanoseconds, therefore, modulation BW is limited to only a few hundred megahertz
  • Low coupling efficiency-usually low optical power coupled into the fiber (W)
  • Large chromatic dispersion
  • Driving LED hard in ambient temperature may result in overheating of the LED package, eventually leading to device failure
  • Incoherent light source
  • Spontaneous emission and non-linear output characteristics
  • Little effective in a wide area

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