RE: Re: White LED Lighting... was RE: Re: ADSL vs Cable

["i.bird@xxxxxxx" <Ian@xxxxxxx>]

This may seem really obvious but why don't you run the 12volt or whatever
feed like a ringmain and then hang your LEDs and resistors off it?

2 wires only + tails

Ian B

Original Message:
-----------------
From: Frank Mc Alinden armagh@xxxxxxx
Date: Wed, 24 Apr 2002 23:24:54 +1000
To: ukha_d@xxxxxxx
Subject: Re: White LED Lighting... was RE: [ukha_d] Re: ADSL vs Cable


Hi Kevin
            I just
wish computing was as easy as connecting leds . Maybe the Computer guru,s
can help me make sense of all their jargon .Anyway for you me Keith Ian B
and other electronic  buffs series parallel doesnt matter but for the
non electronic people make it nice and easy .
Frank Mc  
  ----- Original Message ----- 
  From: Kevin Hawkins 
  To: ukha_d@xxxxxxx 
  Sent: Wednesday, April 24, 2002 11:04 PM
  Subject: RE: White LED Lighting... was RE: [ukha_d] Re: ADSL vs
Cable


      Crossed messages - Frank - yep - saw what
you meant when I reread the post ( see other reply) - I have difficulty
thinking above three after a long lunch, sometimes even before . You can
save two resistors though at 2p ea - oh - forgot there's the extra wire
though ;).

      Kevin

  - Look after the milliwatts and the watts will look after
themselves.


    -----Original Message-----
    From: Frank Mc Alinden [mailto:armagh@xxxxxxx]
    Sent: 24 April 2002 13:56
    To: ukha_d@xxxxxxx
    Subject: Re: White LED Lighting... was RE: [ukha_d] Re:
ADSL vs Cable


    Hi Kevin
               
But if for instance you have 12 leds on your
    skirting which will all operate together you have to get
a supply from the first one to the 4th one to the 7th one the to the 10th
one and all to save .2w per led. The parallel system requires you to put
the resistor at the tap of point or at the led .The serie application would
suit what i have in mind eg Garden lites.
    Frank Mc
      ----- Original Message ----- 
      From: Kevin Hawkins 
      To: ukha_d@xxxxxxx 
      Sent: Wednesday, April 24, 2002 10:44 PM
      Subject: RE: White LED Lighting... was RE:
[ukha_d] Re: ADSL vs Cable


          The wiring
complexity is really the same in both situations - you need just two wires
to each led - in the series solution you save four connections as you lose
two resistors and also you only have to break one of the wires at each LED
so you save 3/6 connections there. You just interrupt one strand of the
cable at each led (except the last one) v having to connect across each
time. If anyone wants I'll draw a diagram.

          Kevin




        -----Original Message-----
        From: Frank Mc Alinden
[mailto:armagh@xxxxxxx]
        Sent: 24 April 2002 13:31
        To: ukha_d@xxxxxxx
        Subject: Re: White LED
Lighting... was RE: [ukha_d] Re: ADSL vs Cable


        Quite Correct Keith
                                   
But from a wiring point of view were there are a string of leds along a
skirting in a hallway for instance i would imagine  wiring them
individually using speaker wire in parallel would be easier especially
for  guys who are not into electronics.The 3 in series is good for a
cluster were you need more lite .
        Frank Mc
          ----- Original
Message ----- 
          From: Keith Doxey
          To: ukha_d@xxxxxxx
          Sent: Wednesday,
April 24, 2002 10:19 PM
          Subject: RE: White
LED Lighting... was RE: [ukha_d] Re: ADSL vs Cable


          If you put 3 LEDs in
series you only need one resistor per 3 LEDs

          Power disipated
(WASTED) by the resistor is also reduced to a third as it is only dropping
3v now.

          also using the
series method you are lighting 3 LEDs with only 20mA compared to 60mA if
driven individually.

          Total power
consumption is now 33% of what it would have been. 

          Smaller transformer
+ thinner wire + less power = lower running costs = more money left for
toys :-)

          Keith 

          www.diyha.co.uk 
          www.kat5.tv 

           
-----Original Message-----
            From:
Frank Mc Alinden [mailto:armagh@xxxxxxx]
            Sent: 24
April 2002 12:31
            To:
ukha_d@xxxxxxx
            Subject:
Re: White LED Lighting... was RE: [ukha_d] Re: ADSL vs Cable


           
Personally i would use 12vdc bus to power them and use current limiting
resistors for each Led . The  resistor value  would be approx 450
ohm (470). It was calculated as follows
            the led
voltage = 3v approx so 9v must be dropped  across the resistor . The
current = 20mA  divide voltage (9V) by .02
            and
hopefully the answer is 450 otherwise ive just made a fool of myself .Leds
should not be connected in parallel without individual resistors as one
robs the other of current . 
            Frank
Mc
             
----- Original Message ----- 
             
From: Ian Lowe 
             
To: ukha_d@xxxxxxx 
             
Sent: Wednesday, April 24, 2002 9:13 PM
             
Subject: RE: White LED Lighting... was RE: [ukha_d] Re: ADSL vs Cable


             
Straight off, these can't be dimmed by X-10 in the way you mean Nikola,
as
             
they are not 240v replacements.. they are simple components, reqiring a
3V
             
supply. It seems you wire them in serial/parallel networks to provide a
12V
             
system, which can then be used in a system similar to existing 12v
Halogens.

             
The devices themselves vary their light output dependant on current, so
they
             
can be dimmed quite easily, you just need a bit of circuitry to do so..
(or
             
possibly, a dimmable transformer would do the trick.. my leccytronics
isn't
             
good enough to be sure)

             
Ian.

             
-----Original Message-----
             
From: Nikola Kasic [mailto:nikola@xxxxxxx]
             
Sent: 24 April 2002 11:47
             
To: ukha_d@xxxxxxx
             
Subject: RE: White LED Lighting... was RE: [ukha_d] Re: ADSL vs Cable


             
I might be interested, but I'm not sure.
             
Can you tell me can they be dimmed using some kind of X10 dimmer?
             
I'm looking for some lighting solution for my hallway. I want to put
             
recessed lights because utility room doors ara just 2-3 cm below the
ceiling
             
and they hit the current light unit and broke it. But my problem is that
my
             
suspended ceiling (plasterboard) is just 5 cm from concrete ceiling.
That's
             
not enough for putting any halogen light, because of the heat. That area
is
             
not ventilated, of course, it's just a plasterboard screwed onto wooden
             
battens.
             
Could this be a solution then?
             
Nik
             
-----Original Message-----
             
From: Ian Lowe [mailto:ian@xxxxxxx]
             
Sent: 24 April 2002 10:00
             
To: ukha_d@xxxxxxx
             
Subject: RE: White LED Lighting... was RE: [ukha_d] Re: ADSL vs Cable


             
yeah,

             
I found a company in korea doing MR14 MR16 sized replacements for the
small
             
Lv Halogens, in 20W equivelants. These were clusters of 15 LEDs, each
             
producing about 3Cd..

             
Since digging more and more, I found a maglite like torch quiting a 42
             
Candela output in white, using THREE LEDs!! it was also 100,000 year
(Ten
             
Years continuous use) LED life, and about 100 hours on three AA cells..

             
so I had a further rummage, and found what I believe to be the highest
rated
             
white LEDS available on the market now...

             
12 Candela units, from computronics in Australia. (they are selling a bag
of
             
500 for about ?300 + shipping)

             
The bizzare thing for me is this:

             
the 2500mcd ones use 20mA at about 3.8V optimal..

             
And the 12000mcd ones, despite being nearly five times brighter use,
er,
             
20mA at about 3.8V

             
I'm totally smitten!!

             
The idea of having a cool crisp light (I like a slight blue tint at the
best
             
of times, so the lack of any "red" component doesn't bother me)
that can be
             
used with normal usage patterns for 25 years and uses about >ONE<
Watt in
             
place of a 50W Halogen, whilst producing an equivelant 80W light level
is
             
pretty amazing..

             
I'm having ideas of totally cool under cupboard lighting, but having
twice
             
as much light for about 4% of the leccy... :)

             
more research required...

             
as an aside, if we don't get a European supplier, is anyone interested
in
             
chipping in for some of the LEDs from Computronics. I think it works out
at
             
about 60p each. ?

             
Ian



             
-----Original Message-----
             
From: paul_watkin [mailto:paul_watkin@xxxxxxx]
             
Sent: 23 April 2002 20:31
             
To: ukha_d@xxxxxxx
             
Subject: White LED Lighting... was RE: [ukha_d] Re: ADSL vs Cable


             
Nichia have the brightest white LED's on the market at about 6.4cd in
             
a T1 3/4 package or 3.2cd in T1

             
http://www.nichia.co.jp

             
Not sure who in Europe holds a disty franchise for Nichia though, try
             
Arrow, EBV somebody like that. I'll try and find out who it is
             
tomorrow.

             
Other companies to look at are Panasonic, Lumiled (Agilent and
             
Philips Joint venture to replace the lightbulb with led's) and also
             
Agilent Technologies.

             
Although you would probably need an account with somebody like Arrow
             
or EBV to get access to stuff from the above suppliers.

             
Regards

             
Paul

             
--- In ukha_d@y..., "PatrickLidstone" <patrickl@t...>
wrote:
             
> >
             
> > Due to really awful search functions (and every electrical
             
appliance
             
> > containing LEDs), I can't find details.  There is a 3mm LED
on
             
the
             
> Maplin
             
> > site
             
> > (http://maplin.co.uk/products/details.php?
             
> cartid=0204231835361451415&modulec
             
> > ode=&moduleno=17821&manufacturer=Nichia).  I based
my thoughts on
             
> the
             
> > variety of LED torches around.
             
>
             
> Rapid Electronics do a separate opto-electronics catalogue -
             
probably
             
> worth a gander.
             
>
             
> You'll find full tech specs on RS (Radio Spares) and Farnell
             
websites
             
> for a huge range of LEDs.
             
>
             
> Patrick



             
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