From: "Michael A. Terrell"
Subject: Re: Best way to power array of LEDs?
Date: Tue, 08 Oct 2002 13:45:29 -0400
Organization: Do I have to? Well, Ok. If you insist!
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References: <0001HW.B9C26E7400A7161B165FEAC0@news.covad.net> <3D9D3A1F.97DB97B4@prontoREMOVETHISmail.com> <3DA03315.9506C177@prontoREMOVETHISmail.com>
Lizard Blizzard wrote:
> James Sweet wrote:
> > The traffic light LED's use a transformerless power supply usually so they
> > flicker at 60 Hz, the yellow doesn't flicker because it's incandescent,
> > they're on so little that the savings of using LED's for them would be
> > minimal.
> Around the city, I've noticed thast even the yellow stop lights are
> LEDs. I believe the reason was that if the yellow lamps were left
> incandescent, then the system would still have to use AC line voltage.
> I think one thing was contemplated when they converted to LEDs, the use
> of lower power and voltage would allow the whole traffic light system
> run off backup batteries. This was important in the last year or so
> because of the possibility of rolling blackouts in (So.) California.
> ----------------(from OED Mini-Dictionary)-----------------
> PUNCTUATION - Apostrophe
> Incorrect uses: (i) the apostrophe must not be used with a plural
> where there is no possessive sense, as in ~tea's are served here~;
> (ii) there is no such word as ~her's, our's, their's, your's~.
> Confusions: it's = it is or it has (not 'belonging to it'); correct
> uses are ~it's here~ (= it is here); ~it's gone~ (= it has gone);
> but ~the dog wagged its tail~ (no apostrophe).
> ----------------(For the Apostrophe challenged)----------------
> From a fully deputized officer of the Apostrophe Police!
Here in Central Florida I see them replacing the red lights with LED
assemblies, but not the yellow or green. I have noticed a few already
have a couple bad LEDs and haven't been in use for a full year.
Michael A. Terrell