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


  • To: <ukha_d@xxxxxxx>
  • Subject: RE: White LED Lighting... was RE: Re: ADSL vs Cable
  • From: "Keith Doxey" <lists.diyha@xxxxxxx>
  • Date: Wed, 24 Apr 2002 19:07:08 +0100
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You can do it just as easily with only 3 wires like this. 4 core alarm cable is ideal
 
 
 
+ve -----------------------------------------------------------------------------------------------------------------------
                                                                               
(third wire)     resistor------led1-----led2----led3--              resistor-----led4-----led5----led6--
                                                                                                                             
-ve -----------------------------------------------------------------------------------------------------------------------------
 
 
Hope that comes out OK !
 

Keith

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

-----Original Message-----
From: Frank Mc Alinden [mailto:armagh@xxxxxxx]
Sent: 24 April 2002 13:31
To: ukha_d@xxxxxxxSubject: 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 -----
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@xxxxxxxSubject: 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
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@xxxxxxxSubject: 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@xxxxxxxSubject: 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@xxxxxxxSubject: 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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