LED Lights observation?

[RobCo]

There may be other threads about this and I apologize if there is, but I've noticed in several videos that the LED lights on the Bronco seem to flicker a lot.
Is this a bug or just due to video recording? a good example is in this Wildtrak video

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[Deleted member 9490]

Its the frame rate off the recording equipment giving the illusion of the lights flickering.

 

[TheKim]

There may be other threads about this and I apologize if there is, but I've noticed in several videos that the LED lights on the Bronco seem to flicker a lot.
Is this a bug or just due to video recording? a good example is in this Wildtrak video

LED lights cycle, or turn on/off while operating at a very fast speed. Typically they're set to 120Hz cycles, or 120 on/off per second. They're actually doing this all the time, and you just don't see it in a day to day basis. I've seen some lights that have a 60Hz cycle, specifically fluorescent bulbs, and it's actually noticeable.

https://ledlightinginfo.com/why-do-led-lights-flicker-on-video

 

[RobCo]

I figured it was something like that

thanks

 

[MacDonald_Photo]

LED lights cycle, or turn on/off while operating at a very fast speed. Typically they're set to 120Hz cycles, or 120 on/off per second. They're actually doing this all the time, and you just don't see it in a day to day basis. I've seen some lights that have a 60Hz cycle, specifically fluorescent bulbs, and it's actually noticeable.

https://ledlightinginfo.com/why-do-led-lights-flicker-on-video

Yep...They need to record video at 24p

 

[Felix808]

I figured it was something like that

thanks

I use to think the same & that it would end up giving me or someone around me a seizer looking at that all the time.

 

[peta8368]

yah, to add to what others have already shared, the phenomenon is called "Flicker Fusion". Essentially, when you see an image/light/stimulus, and the image/light stops, your brain processes it in a way that it appears to "fade" away in your interpretation. And if the stimulus comes back before it's completely faded away, then the image picks up again. So when the light cycles on and off very rapidly, your brain interprets that as a steady light.

Incidentally, by changing how long the light stays off vs on, it can tricks the brain into a perceived "brightness". This is how LED "dims".

https://en.wikipedia.org/wiki/Flicker_fusion_threshold

On a camera, when the sample rate happens to line up mostly with the "off" cycles, and only periodically line up with the "on" cycle, the captured video will show it as "flickering". That's why when the frame rate of the camera doesn't line up with the flicker rate of the LED, you actually see the flicker. Simplified illustration below. Bold O signifies where it lines up and the camera shows it as "on". You can see how it is much further apart than the actual "on" cycles.

O---o---o---o---o---O---o---o
O----o----o----o----O----o----o

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