The argument related to this is that if you are under full braking,
then the extra 3 metres represents a considerable difference in
collision velocity. A recent TV ad here suggested thart for 2 meters
this was of the order of 20km/hr IIRC.

RP


On 02/03/06, Michael Rigby-Jones <Michael.Rigby-Jones@bookham.com> wrote:
>
>
> >-----Original Message-----
> >From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu]
> >Sent: 02 March 2006 10:02
> >To: Microcontroller discussion list - Public.
> >Subject: Re: [EE] LEDs as lighting
> >
> >
> >>One of the safety features touted for the LED based
> >>center brake lights is the instant on time.
> >
> >Oh, haven't heard that claim actually made. I would have
> >thought the only real safety feature is they are less likely
> >to burn out.
> >
> >>Wether the time difference is actualy reduces
> >>accidents I don't know,
> >
> >I have serious doubts that it does. After all a filament bulb
> >is essentially instant on anyway, it must take all of 100 mS
> >to reach full brightness, and fade again - apart from
> >headlights that is where the fade of the glow is easily seen
> >in the dark.
>
> One argument would be that at 70mph you travel a bit over 3 meters in 100ms, which is about one car length...
>
> Regards
>
> Mike
>
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