LED holiday lights [RE-wrenches]

[sunwise]

Steve, you are always going to be the center of the DC x-mas lites
universe.  

Thanks -- Kurt

-----Original Message-----
From: Steve Willey, Backwoods Solar [mailto:steve at backwoodssolar.com] 
Sent: Saturday, November 23, 2002 9:13 PM
To: RE-wrenches at topica.com
Subject: Re: LED holiday lights [RE-wrenches]

Just watch out for converting to DC those LED lightstrings with a
cycling
controller box. Remember they use AC to light the string, so half the
LEDs
are reverse polarity. Pulse chopping positive and negative halves of the
sine wave is sometime used to create parts of those patterns.  A few I
tried
to convert required reversing polarity on only half will light, so the
polarity pattern has to match your fifths chopping or you have a big lot
of
labor there.
Steve Willey       steve at backwoodssolar.com
www.backwoodssolar.com
Backwoods Solar Electric Systems
Home electricity from sunlight for
locations with no utility lines.
Free instructional catalog.
----- Original Message -----
From: "sunwise" <sunwise at cheqnet.net>
To: <RE-wrenches at topica.com>
Sent: Saturday, November 23, 2002 6:19 PM
Subject: RE: LED holiday lights [RE-wrenches]


> If you gotta get "into" Christmas, this is the way to do it.  I'd say
> they are all in series, chop em in fifths for 24VDC'ers and littler
> chunks for 12V, say seven to a string.  Someone I know who bought some
> says there are only 35 in a Blue string.  Aren't those blues higher
> voltage by quite a bit, 3.75?  There must be 35 LEDs in the whites
too.
> Seems like they might be overdriving the mixed color sets and
> under-driving the blues??  Ya gotta buy more color but the blues will
> last you a lifetime.
>
> Kurt Nelson
>
> -----Original Message-----
> From: Todd Cory, Mt. Shasta Energy Services
> [mailto:toddcory at finestplanet.com]
> Sent: Saturday, November 23, 2002 7:19 PM
> To: RE-wrenches at topica.com
> Subject: Re: LED holiday lights [RE-wrenches]
>
> The Forever Bights are a series string of 70, pull one out and the
whole
> string
> goes dead. I measured the blue ones draw at 5 watts, and the multi
> colored at
> 2.5 watts. I am not sure how they can series them to work on 120 VAC,
> but they
> are rapidly flashed (too fast to notice unless the lamp is moved) so
> maybe each
> LED has some kind of processor in it that limits the current and does
> the
> flashing? I am not sure how they work, but they are WAY cool and use
> next to no
> power. There are not too many DC only applications these days except
> automotive.
>
> Todd
>
>
> "Steve Willey, Backwoods Solar" wrote:
>
> > We have a fellow up the road who has made DC LED light strings for
us
> for 15
> > years.  Hand mad they are too costly, its one item we make nothing
on,
> and
> > give no dealer discounts on.  It would b great if the ForeverBrights
> could
> > be wired in the proper series groups to accept 12 and 24 volt DC
> inputs.
> > Standard Red-Yellow-green LEDs take six in series for 12 volts, but
> super
> > brights and whites are different.
> > Steve Willey       steve at backwoodssolar.com
>
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