From: email@example.com (Don Klipstein)
Subject: Re: Deep red, ultra bright LED manufacturers?
Date: Fri, 1 Nov 2002 04:55:51 +0000 (UTC)
Organization: MGT Consulting
References: <firstname.lastname@example.org> <3DC06FB1.A86C90E5@rica.net>
NNTP-Posting-Date: Fri, 1 Nov 2002 04:55:51 +0000 (UTC)
User-Agent: slrn/0.9.6.2 (SunOS)
In article ,
Michael Painter wrote:
>"Malcolm Reeves" wrote in message
>> On Wed, 30 Oct 2002 23:48:01 GMT, John Popelish
>> >The eye is about twice as sensitive to red-orange light than it is to
>> >pure spectral red. So if you are trying to get someone's attention,
>> >deep red is not the best color.
>> No, just meeting the customers spec (which IMO is not entirely
>> sensible from the eye's point of view :-)).
>will lead you to somebody who will know.
>The 5 watt LEDs are available now and are in the ultra bright class.
I peep over there a bit lately, and I do check out Lumileds' "Luxeon"
website (http://www.luxeon.com). Seems like no 5 watt reds available yet.
They got some real kicker 1 watt reds, but dominant wavelength is 626 nm.
Brightest reds I saw with dominant wavelength (color specification) near
650 nm were some Toshiba ones. But even pushing those, you get almost 1
lumen of light out of them. One of these is the Radio Shack 276-086, a
10 mm jumbo with a dominant wavelength in the upper 640's and a peak
wavelength in my experience a little more than the claimed 660 nm.
Just beware that they claim a 30 degree 5,000 mcd beam, and I find the
beam to be about half that size and only the core few degrees seem to be
that bright (at the usual 20 mA).
If you are not dealing with large quantities, you may be able to make a
red Luxeon adequately more red with a Wratten 29 filter.
- Don Klipstein (email@example.com)