Hacker News Reader

Not following an object - this is the procedure:

1. Put LED at the bottom of vision 2. Look below LED, so now it’s at the top of vision 3. There’s a trail of light for a fraction of a second, seeming to start from the bottom of vision to the top.

I’m not smoothly tracking anything, just looking at one point and then another. I can clearly see the on-off duty cycles, and I’ve been playing with training myself to estimate frequencies with this method.

View on HN

Hmm. I see something similar when looking quickly at or away from bright text (eg. end credits) on a DLP projector; it will get split into its constituent colors in the direction of my eye's movement. I guess the "double buffering" functionality does not completely shield one from experiencing the interim flashes.

That's what I do as well with tail lights of cars. There is a clear distinction between LED and normal lights: the LED's form a trail of dots.

Reply on news.ycombinator.com