Subject: Re: Very inexpensive white LEDs?
Date: Sun, 17 Nov 2002 22:56:27 -0800
Organization: SCN Research of Tigard, Oregon, USA.
NNTP-Posting-Date: Mon, 18 Nov 2002 06:56:32 +0000 (UTC)
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You talking about the JKL ones?
"Bob Wilson" wrote in message
> In article <3DD78F06.email@example.com>,
> >jeremy wrote:
> >> I've obtained white LEDs from www.theledlight.com, and was very happy
> >> with them. However, in quantities of 6, a 6400mcd 5mm 20 degree LED
> >> is $2.75 each.
> >> At www.superbrightleds.com, they have 10,000 mcd, 5mm, 15 degree for
> >> $1.68 each, less in quantities!! I have never seen them this cheap
> >> before, and this one seems to be no wimp, either. Has anyone here
> >> ordered from them before? Are the LEDs good, and as bright as
> >> advertised? I just find this price hard to believe.
> >> TIA
> >The price may not be steep, but the viewing angle is. That's how they
> >got the brightness up so high. ok if you want a spot light though. One
> >thing I have seen before is some so-called white LED's turn out to be
> >more like blue with a yellow halo. I have one, and it's useless.
> An alternative, and rather clever, idea is to use ordinary blue LEDs and
> slip silicone "booties" over them that contain yellow phosphor. Forgot who
> makes them but I can dig up the name of the company. The mechanism is the
> same as a real white LED (they, too are simply blue LEDs with a yellow
> phosphor mixed in with the epoxy encapsulant). But there are a lot more
> possibly cheaper) blue LEDs out there than white ones, and the silicone
> "bootie" method actually claims better colour temperature control.