Don Klipstein wrote:
I sometimes see flicker in TVs and monitors set to 60 Hz. I usually see
flicker in monitors set to 56 Hz.

I also only sometimes see LED lights flickering when they have 60 Hz
flicker. I suspect that the flicker gets more visible when the light
source is more intense - possibly explaining why LEDs are more likely to
visibly flicker at 60 Hz than TVs and monitors are.

I'm going to say one word, and you decide if you still like your theory.

Persistence.

--
If John McCain gets the 2008 Republican Presidential nomination,
my vote for President will be a write-in for Jiang Zemin.