7 ms·

Or just look at your finger while you wiggle it vigorously.

• Vinnl 8y ago
  What would you see with, and what without flicker? I can wiggle my finger vigorously, but now I still don't know whether my LEDs flicker...
  • angersock 8y ago
    You'll see extra discrete instances of your finger, as though lit by a strobe light. This is how we used to be able to measure speed of spinning objects too. :)
  • dash2 8y ago
    Maybe not, but if you do it hard enough while listening to some terrible music, you'll have replicated my 90s clubbing experience.
  • kozak 8y ago
    With a continuous (non-flickering) light you see your blurred finger. With a flickering light, you'll see your blurred finger with gaps in the blurring. This effect is especially pronounced with sharp-flickering light (like in LEDs) as opposed to gradually-flickering light (as in incandescent bulbs). CCFLs are somewhere in the middle.