Re: Led lights

["Rob Lamb" <rjl@xxxxxxx>]

White LEDs are actually blue ones with a phospher coating much the
same as a hot cathode fluorescent tube. The UV produced by the blue
light 'excites' the phospher coating. Unfortunately it's fairly
difficult to acheive in a stable format and even more difficult to
produce an even colour temerature. We use white LEDs by the thousand
to illuminate our signage products and find 'white' LEDs come in
every colour from yellow to pink. By mixing and matching we can
produce an even 'white' colour.

Rob

--- In ukha_d@xxxxxxx, Mark Hallows <markhallows@xxxxxxx; wrote:
> Cool Ian
>
> Thanks for that.. i will now go and buy some... Just get a bit fed
up with
> getting ripped off normally.. If I had an IQ above double figures
I would
> ask you why white LED's are so hard to produce.. As it is I may not
> understand the answer and may feel even less smart than I do
already..
>
> Thanks
>
> Mark H...
>
> -----Original Message-----
> From: Ian Lowe [mailto:ian@xxxxxxx...]
> Sent: 06 February 2004 14:47
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] Led lights
>
>
> Very bright Orange and Red leds are (and have always been)
dramatically
> easier to produce and therefore cheaper:
>
> When I worked in Craplins, Blue Leds had just appeared and white
was a
> "wouldn't it be nice".. the blue leds were nearly a tenner
each
whilst
> the reds were oh... about 10p each!
>
> White Leds, especially the ultra-bright ones are a big money item
to
> manufacture: it's going to be some time before we see them at
similar
> prices to the reds and oranges are just now.
>
> I.
>
> -----Original Message-----
> From: Mark Hallows [mailto:markhallows@xxxxxxx...]
> Sent: 06 February 2004 14:37
> To: 'ukha_d@xxxxxxx'
> Subject: RE: [ukha_d] Led lights
>
>
> I just went to the TLC website and was unpleasantly surprised to
find
> that
> white LED GU10's are nearly double the price of the Orange and
Reds...
> Is
> there any reason for this other than to (as bloody always) rip off
the
> consumer ?
>
> Mark H.
>
>
>
>
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