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

["Nikola Kasic" <nikola@xxxxxxx>]

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 ?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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