Cecil Moore wrote:
David G. Nagel wrote:

Yes I have seen these taillights. According to a news article about
them there is a significant difference in how fast the new lights work
compared to the older conventional lamps. One time I was following a
truck that had diode lights on its trailer and conventional lamps on
the tractor. There was a very noticeable difference in the two tail
lights. The diode lamps were full on while the conventional lamps were
still thinking about glowing. Supposedly this converts to about 17
feet difference at 55-65 miles per hour on the highway.


Hi David, I'm not talking about conventional LED taillights. I'm
talking about LED taillights that are pulsed and maybe pulse-width
modulated between the taillight function and the brakelight function.
This seems to be something new on maybe one manufacturer's 2005
models. They may have a 1/3 duty cycle for taillights and a 2/3
duty cycle for brakelights, or something akin to that. It's a
mystery to me that I am trying to solve.

Some lights on towers and some roadside warning lights are pulsed on
and off at a ballpark rate of 100 Hz. If you sweep your eyes from
side to side, these pulsed lights appear as a dotted line in your
vision. That's the kind of taillights I am talking about. If you
sweep your eyes from side to side, the trail they leave on your
retina looks something like this:

____ ____ ____ ____ ____ ____ ____ ____

Thanks for your response. No, I have not seen the lights you describe. I
can see how they would work though. I'll keep my eyes out for them.

Dave