Atmospheric Extinction of Light

  • Thread starter MK-IV
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  • #1
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Main Question or Discussion Point

If I have a 2,000 candelas red light source under normal rural atmospheric conditions at what distance would I expect the source to no longer be visible to the eye?
 

Answers and Replies

  • #2
Drakkith
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Are you assuming an atmosphere that is almost completely free of dust and other particles that would also absorb the light?
 
  • #3
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I am assuming a normal rural atmosphere in the western United States containing dusts with a relatively low humidity component.
 
  • #4
Drakkith
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I am assuming a normal rural atmosphere in the western United States containing dusts with a relatively low humidity component.
Hrmm. I can't help you out, but hopefully someone else can.
 
  • #5
If I have a 2,000 candelas red light source under normal rural atmospheric conditions at what distance would I expect the source to no longer be visible to the eye?
At first glance, it would seem that this may depend on the time of day. In the way that the Sun blinds us from stars.
 
  • #6
K^2
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I have no idea where to actually get sufficient data to compute this, but from visibility requirements I remember from flight training, I could tell you that the answer would vary greatly with weather, season, and location. So if you need a specific answer, you are going to have to provide more specific situation.
 

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