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Why infrared transmitters cannot be used for long time ?

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A.Anand Srinivasan

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infrared

i have heard that infrared transmitters and receivers and transmitters cannot be used for longtime continuously can someone tell me what is the limitation factor in their usage
 

Re: infrared

LED emitters degrade with temperature and time. If you put less than the maximum current through them they will last longer.
 

Re: infrared

due to short wavelength cant useful for long distance transmission .
 

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