C7 Taillight Pulse
Le Mans Master
Joined: Dec 2004
Posts: 5,759
Likes: 539
From: AZ
St. Jude Donor '06-'08-'10-'11-'12-'13 '14-'15-'16-'17-'18-'19
I asked this question also. I can't tell you the technical details but basically what it came down to is pulsing of the LED's as well as frame rates the camera used. Similar to the old wagon wheels being taped and they appear to slow down or even reverse at times even though we know they aren't. Hope that helps.
Le Mans Master
Joined: Aug 2002
Posts: 8,222
Likes: 0
From: Norfolk VA
I asked this question also. I can't tell you the technical details but basically what it came down to is pulsing of the LED's as well as frame rates the camera used. Similar to the old wagon wheels being taped and they appear to slow down or even reverse at times even though we know they aren't. Hope that helps.
If you film a TV screen it'll do the same thing. It's blinking faster than we can see in person, but sometimes the camera will catch the LED when it's in its off and it looks like they're blinking on camera.
Scraping the splitter.
Joined: Jun 2005
Posts: 8,111
Likes: 1,029
St. Jude Donor '13-'14-'15
GM isn't going to be selling a Corvette with defective or flickering tail lights.
S.
_Sloth Whisperer_
Joined: Jul 2008
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From: Malaysia Air Flight 370
Le Mans Master
Joined: Nov 2004
Posts: 5,886
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From: Cape Coral FL
It is legal. I have seen a couple of Porsches around here with pulsating brake lights
the adaptive LED brake lights on all Panamera models pulsate to alert following traffic more quickly to a critical situation.
the adaptive LED brake lights on all Panamera models pulsate to alert following traffic more quickly to a critical situation.
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Brett Foote
Instructor
Joined: Jan 2011
Posts: 234
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From: Decatur Illinois
St. Jude Donor '13
I noticed the taillights pulse when the brake is applied, see video below is this true or just a phenomenon of LEDS being video taped.
http://youtu.be/ruJzI7VNfC0
http://youtu.be/ruJzI7VNfC0
Killer, How long did you get to talk to them and what were they doing? Wow !!!
Burning Brakes
Joined: Aug 2004
Posts: 802
Likes: 1
LED xmas lights do this same thing when video recording them. The camera frame rate is slightly off from the LED lights causing a steady light then it disappears then reappears repeatedly.
BTW, I can see the Caddy tail lights flickering when I follow a Caddy and when glancing sideways, I can see the flicker. Really anoying.
steve L
73 coupe since new
BTW, I can see the Caddy tail lights flickering when I follow a Caddy and when glancing sideways, I can see the flicker. Really anoying.
steve L
73 coupe since new
Safety Car
Joined: Apr 2007
Posts: 4,548
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From: Southeast, WI
The video was taken in or near Mesa AZ. That is just east of the city of Phoenix.
Racer
Joined: Aug 2001
Posts: 352
Likes: 0
From: San Diego CA
Diodes only allow current to flow in one direction, so light emitting diodes only glow when the voltage across them is, say, positive to negative rather than negative to positive. Since most christmas lights just run off of wall AC power (without an AC to DC converter brick) those flicker at 60 Hz just like the voltage coming out of the wall.
Since car electrical systems are DC, you wouldn't think that the LEDs in the tail lights would flicker. However, car taillights need to vary in brightness depending on whether the brake is being pressed. It turns out that the best way to do that with LEDs while maintaining the same color is add a tiny bit of circuitry to pulse them on and off (more off when the brake is not pressed). This is called "pulse width modulation" if you want to google more info.
I think different vehicles use different pulse frequencies. I can see the strobing in some (but not all) LED tail lights at night if I move my eyes quickly. Some people can't see it at all and some say they can see it without moving their eyes, so people's sensitivity to it differs as well.
Instructor
Joined: Jan 2011
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From: Decatur Illinois
St. Jude Donor '13
Banned Scam/Spammer
Joined: May 2006
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From: Fort St John B.C
Didnt they sell 8 years worth of corvettes with column lock issues?