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Author Topic: LED rear light caused headache  (Read 2429 times)

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Martin_1962

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LED rear light caused headache
« on: 09 November 2008, 11:29:22 »
Following one a few days ago - started to cause me a headache.

VEry bright and only on about 10% of the time, so noticiable flicker, I think it was a Jaguar.

FIrst time I have had this - very umpleasant
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Tony H

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Re: LED rear light caused headache
« Reply #1 on: 09 November 2008, 15:34:11 »
Best bet would have been to close your eyes then ::) ;)
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tunnie

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Re: LED rear light caused headache
« Reply #2 on: 09 November 2008, 15:35:37 »
friends always commented mine is very bright!
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Welung666

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Re: LED rear light caused headache
« Reply #3 on: 09 November 2008, 15:36:07 »
Or a BB gun n shoot his lights out  ;D ;D ;D NB just kiddin'! :D
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Darkus Lordus

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Re: LED rear light caused headache
« Reply #4 on: 09 November 2008, 19:57:59 »
 [smiley=undecided.gif] I started reading this thread thinking that you had one on your Omega & it was that one that was causing you a headache!  :-[

I would have thought it would be the HID headlamps from Jags, BMWs & Mercedes that would have caused a headache.

How long was spent behind this uber bright rear Led brake light?

Never look into the light.....  [smiley=laugh.gif]
« Last Edit: 09 November 2008, 20:00:04 by DarkusLordus »
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Martin_1962

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Re: LED rear light caused headache
« Reply #5 on: 09 November 2008, 21:10:17 »
Rear lights about 2 minutes
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Kevin Wood

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Re: LED rear light caused headache
« Reply #6 on: 09 November 2008, 23:29:39 »
I know some of them PWM (rather slowly) to reduce the intensity as tail lights. They always get to me. Why they couldn't switch them at a sensible rate I don't know. Or were they actually flashing for some reason?

Kevin
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Martin_1962

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Re: LED rear light caused headache
« Reply #7 on: 10 November 2008, 08:09:47 »
Quote
I know some of them PWM (rather slowly) to reduce the intensity as tail lights. They always get to me. Why they couldn't switch them at a sensible rate I don't know. Or were they actually flashing for some reason?

Kevin


Nope a strong flickering - all on all off about 15 to 20 times a second
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Marks DTM Calib

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Re: LED rear light caused headache
« Reply #8 on: 10 November 2008, 08:34:25 »
Quote
I know some of them PWM (rather slowly) to reduce the intensity as tail lights. They always get to me. Why they couldn't switch them at a sensible rate I don't know. Or were they actually flashing for some reason?

Kevin


I cant beleave they switch them at 30Hz or less....in which case, it aint that.

LED's (more so the uber bright) do tend to have a narrow viewing angle and very narrow bandwidth.....which is more likely to be the route cause.
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Kevin Wood

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Re: LED rear light caused headache
« Reply #9 on: 10 November 2008, 09:38:17 »
Quote
Quote
I know some of them PWM (rather slowly) to reduce the intensity as tail lights. They always get to me. Why they couldn't switch them at a sensible rate I don't know. Or were they actually flashing for some reason?

Kevin


I cant beleave they switch them at 30Hz or less....in which case, it aint that.

LED's (more so the uber bright) do tend to have a narrow viewing angle and very narrow bandwidth.....which is more likely to be the route cause.

They're slow enough to be irritating when you move your eye across them, although when viewed statically there's no flicker. Certainly not down to 30Hz but probably only a few hundred. This sounds more like some sort of bizarre fault though.

Kevin
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Martin_1962

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Re: LED rear light caused headache
« Reply #10 on: 10 November 2008, 10:13:41 »
If I shook my head it was very obvious. was basically a couple of columns and appeared like this.

:: :: ::
:: :: ::
:: :: ::

Not viewing angle, but driving frequency.

They should be driven so that there are some lit all of the time.
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Martin_1962

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Re: LED rear light caused headache
« Reply #11 on: 10 November 2008, 10:14:57 »
Quote
Quote
Quote
I know some of them PWM (rather slowly) to reduce the intensity as tail lights. They always get to me. Why they couldn't switch them at a sensible rate I don't know. Or were they actually flashing for some reason?

Kevin


I cant beleave they switch them at 30Hz or less....in which case, it aint that.

LED's (more so the uber bright) do tend to have a narrow viewing angle and very narrow bandwidth.....which is more likely to be the route cause.

They're slow enough to be irritating when you move your eye across them, although when viewed statically there's no flicker. Certainly not down to 30Hz but probably only a few hundred. This sounds more like some sort of bizarre fault though.

Kevin

Even though you couldn't see the flickering unless you moved your head, you could sense it, I reckon some people would even get a migrain triggered by them
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Marks DTM Calib

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Re: LED rear light caused headache
« Reply #12 on: 10 November 2008, 10:23:44 »
Quote
If I shook my head it was very obvious. was basically a couple of columns and appeared like this.

:: :: ::
:: :: ::
:: :: ::

Not viewing angle, but driving frequency.

They should be driven so that there are some lit all of the time.

Thats likely to be more down to some sort of defraction grating in the lense setup.

Certainly jack all to do with the switching frequence.....if thats above 30Hz you wont notice it.....at 100Hz plus its certainly not the issue.
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Gaffers

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Re: LED rear light caused headache
« Reply #13 on: 10 November 2008, 11:00:32 »
Have you been following a gorgeous XF too closely then?

That'll teach ya!  ;D ;D ;D ;D
« Last Edit: 10 November 2008, 11:00:57 by mrgaffney »
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Martin_1962

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Re: LED rear light caused headache
« Reply #14 on: 10 November 2008, 13:49:49 »
Quote
Quote
If I shook my head it was very obvious. was basically a couple of columns and appeared like this.

:: :: ::
:: :: ::
:: :: ::

Not viewing angle, but driving frequency.

They should be driven so that there are some lit all of the time.

Thats likely to be more down to some sort of defraction grating in the lense setup.

Certainly jack all to do with the switching frequence.....if thats above 30Hz you wont notice it.....at 100Hz plus its certainly not the issue.


No it was the swith frequency imagine that each dot was a diode and normally two columns, move your head and you got the extra columns as they pulsed on and off
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