My problem is simple: given a certain LED spec, how far will that LED be
visible without any other relevant obstacles (fog, pollution, etc) or
obfuscations (think dark night). Assume the LED is being observed at its
most bright angle.

 

Does it depend solely on its brightness? I know our eyes have a certain
resolution limitation and a regular dot the size of a LED would surely not
be visible at great distances (1-3 miles for example), but I'm not sure the
same principle applies if the dot irradiates light.

 

I'm designing a sign to be visible from an airplane that could be anywhere
from 5000 to 15000 ft. The idea is to make an array of LED's, but I wanted
to make some calculations before actually doing any trial and error.
Disregarding proportions, the array would look like this, where LED columns
would be 1 meter apart and rows about 3 inches from each other:

 

.  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .

.  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .

.  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .

 

 

Cheers!

 

Padu

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist