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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: "Aidan Williamson" <fluff@xxxxxxx>
  • Date: Wed, 24 Apr 2002 10:17:57 +0100
  • Delivered-to: ukha_archive@xxxxxxx
  • Delivered-to: mailing list ukha_d@xxxxxxx
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  • Reply-to: ukha_d@xxxxxxx

Any idea on the beam angle for these?

A lot of the high output have a very narrow beam, which could limit the
applications.

A.


> 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. ?
>


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