Quote:
Originally Posted by etherman
...The LED seems stable to my eye, only until I start taking pictures with the iPhone, when it is flickering on the screen.
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The 'flicker fusion threshold' for the human eye is 75Hz if I recall correctly. That's the frequency when a flickering light source appears steady-state to the human eye (brain, obviously).
But this is obviously idiosyncratic, since, for you, it's much lower -- you are registering a 25Hz flicker as steady-state.