96
What is something you can see, hear, smell, etc., that others can't? (lemmy.ml)
submitted 8 months ago by to c/asklemmy@lemmy.ml
180 comments fedilink hide all child comments
 

What is something you can sense that few-if-any people you know can sense? Literal answers only.

you are viewing a single comment's thread
view the rest of the comments
[โ€“] 5 points 8 months ago (2 children)

All lights flicker. Just mostly we can't perceive them.

LED flicker is most noticeable tho. Incandescent the least.

Fun fact. They flicker at similar frequencies (per light output/lumens) but the light drop off is more dramatic for LEDs so we perceive it more.

People who are epileptic or prone to migraines usually are bothered more by LEDs.

  • permalink
  • fedilink
  • source
  • parent
  • hideshow 4 child comments
    •
  • [โ€“] 3 points 8 months ago (2 children)

    All lights? Also battery-fed DC lights somehow?! I'm no expert but that seems strange

    I've caught a lot of lights and light-emitting displays flickering with the 980fps camera that's built into my phone (best thing since sliced bread for a nerd like me), but also quite many lights appear solid. I'd imagine few have such high-frequency electronics that it pulses well beyond 1 kHz. Otherwise the sensor should sometimes capture a frame during a low or a peak

    As an example, I was recently looking at car lights in Germany, expecting to see duty cycling in most modern ones, but the majority (2/3rds or so) were actually solid so far as I could tell. A few cars had a mixture of flickering and solid lights in seemingly the same fixture. All flickering ones were high frequency though, not like 50 Hz as grid-fed lights do but much more. I didn't bother with ffmpeg and counting frames but I estimated on the order of 250 Hz for one of them

  • permalink
  • fedilink
  • source
  • parent
  • hideshow 4 child comments
    •
  • [โ€“] 1 point 8 months ago (1 child)

    Yes all lights flicker. That frequency number is how fast it flickers.

    There has been attempts to reduce flicker.

    It has to do with how electricity works and the filament in the bulb. I honestly don't know the details except that some tech has reduced it in LEDs. They say it no longer has flicker but it's still there. Just reduced.

    I'm going to post another image relevant to this.

  • permalink
  • fedilink
  • source
  • parent
  • hideshow 2 child comments
    •