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

[Mike Griffiths <mike@xxxxxxx>]

Count me in 
Mike

-----Original Message-----
From: Ian Lowe [mailto:ian@xxxxxxx] 
Sent: Wed 24 Apr 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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