4 ms·

In darkness our eyes can easily detect a 1W LED from kilometers away.

• StavrosK 7y ago
  But can they distinguish a specific 300 mW LED in a stadium with tens of thousands of other LEDs next to it?
  • pcnix 7y ago
    If it were a different color, yes. If each of them were a different color, your eye would still be able to, as long as you had enough focus. So the analogy holds pretty well.
  • swiley 7y ago
    My understanding is that healthy human eyes are able to detect individual photons.