LED Bulbs

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commclinic - 09 Jul 2004 02:30 GMT

I'm currently checking out LED brake-light bulbs on my 82 S111. As they
activate measurably faster when the brakes are applied, I would assume
that they would reduce the chances of someone 'rear-ending' me.
Anyone else tried them out?

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Blake Dodson - 12 Jul 2004 20:20 GMT

> I'm currently checking out LED brake-light bulbs on my 82 S111. As they
> activate measurably faster when the brakes are applied, I would assume
> that they would reduce the chances of someone 'rear-ending' me.
> Anyone else tried them out?

Are you making these yourself or are these store bought units? I have
found that most over the counter led are of low wattage.

Now I have seriously thought about making my own lighting using
powerful leds. But I want to take it beyond ordinary by adding a pulse
to the brake circuit...say 100 times per second? Hmmmmmm..... and it
would be a simple tidy package.

BD

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MG - 15 Jul 2004 01:43 GMT

> > I'm currently checking out LED brake-light bulbs on my 82 S111. As they
> > activate measurably faster when the brakes are applied, I would assume
[quoted text clipped - 10 lines]
>
> BD

Why pulsing?
Increase light perception? OK. More perceived brightness for the same
average current.
Attention catching? This will not work, eye does not see flicker above some
50Hz.

MG

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Blake Dodson - 15 Jul 2004 07:55 GMT

> > "commclinic" <admin@nospam.commclinic.com> wrote in message
> news:<329a66e867ba7bcf3176a313702249ca@localhost.talkaboutautos.com>...
[quoted text clipped - 12 lines]
> >
> > BD

> Why pulsing?
> Increase light perception? OK. More perceived brightness for the same
[quoted text clipped - 3 lines]
>
> MG

Well the c.p.s. was not stated to be accurate but to stress the
concept. I think a pulsed light may be more affective getting
attention of some people more than others (some people are simply
brain dead). Yes, for attention.

A pulsed brake circuit that lasts 3-5 seconds before going continuous,
higher wattage LEDS, plug n play... that's what I see. Very small,
very simple. Aimed at bicyclists, and ATV's as I am sure the US FEDS
would frown disapproval for automotive street use.

I'll put the pipe down now... ;-)

BD

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test@test.com - 16 Jul 2004 00:40 GMT

>>"commclinic" <admin@nospam.commclinic.com> wrote in message
>
[quoted text clipped - 22 lines]
>
> MG

You can overdrive the led if you pulse it.
By pulsing it, I mean faster than the eye can detect. The duty cycle of
the pulse will allow you to supply more current than the led can handle
in a steady state condition and be brighter.
This is done quite often.

Cheers

Dave

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