this post was submitted on 03 Dec 2025
97 points (100.0% liked)
Asklemmy
51476 readers
484 users here now
A loosely moderated place to ask open-ended questions
Search asklemmy ๐
If your post meets the following criteria, it's welcome here!
- Open-ended question
- Not offensive: at this point, we do not have the bandwidth to moderate overtly political discussions. Assume best intent and be excellent to each other.
- Not regarding using or support for Lemmy: context, see the list of support communities and tools for finding communities below
- Not ad nauseam inducing: please make sure it is a question that would be new to most members
- An actual topic of discussion
Looking for support?
Looking for a community?
- Lemmyverse: community search
- sub.rehab: maps old subreddits to fediverse options, marks official as such
- !lemmy411@lemmy.ca: a community for finding communities
~Icon~ ~by~ ~@Double_A@discuss.tchncs.de~
founded 6 years ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
I can see lights flicker when others can't.
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.
One word for you: DLP projectors
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
"Sunlight inside" is a lightbulb brand. Led with a modulator.
It's not actual sunlight.
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.
Illustrates two ways to combat flicker in LEDs. It's still there. Just less visible to humans.