[Micah]
> Is a [photo-electric cell] "aware" of the difference between sunlight and a 
> flashlight...
 
Just as you could invent/design a photo-electric cell to react differently to 
light from the red end of the spectrum than to light from the blue end of the 
spectrum, you could invent/design a photo-electric cell to react differently to 
sunlight than to a flashlight, if there was detectable difference in the light 
each produced.  Any other difference between the sun & a flashlight would not 
play a role.
Craig
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