Re: Best way to power array of LEDs?

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#246

From: Lizard Blizzard
Date: Tue, 08 Oct 2002 01:03

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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.

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From: Lizard Blizzard <NOSPAM@rsccd.org>
Newsgroups: sci.electronics.components,sci.electronics.design,alt.engineering.electrical,aus.electronics,sci.electronics.repair
Subject: Re: Best way to power array of LEDs?
Date: Mon, 07 Oct 2002 18:03:14 -0700
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