<html>
<head>
<meta content="text/html; charset=ISO-8859-2"
http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<div class="moz-cite-prefix">On 10/1/2012 11:17 AM,
<a class="moz-txt-link-abbreviated" href="mailto:Cihak@dkv.cst.cd.cz">Cihak@dkv.cst.cd.cz</a> wrote:<br>
</div>
<br>
<blockquote
cite="mid:932C4BA36EAC9D4AB8C39461AFD90E4091E4D9@cd00000unlnt050.mail.cd.cz"
type="cite">
<pre wrap="">Fajnšmekři na ní jistě nějakou chybu najdou, </pre>
</blockquote>
<br>
The 'white' of white LEDs comes from the narrow-band blue naturally
emitted by GaN LEDs, plus a broad spectrum yellow generated by a
phosphor coating on the die which absorbs a proportion of the blue
and converts it to yellow.
(<a class="moz-txt-link-freetext" href="http://www.electronicsweekly.com/Articles/17/04/2008/41947/LED-technology-White-LEDs.htm">http://www.electronicsweekly.com/Articles/17/04/2008/41947/LED-technology-White-LEDs.htm</a>)<br>
<br>
Spectrum of a “white” LED clearly showing blue light directly
emitted by the GaN-based LED (peak at about 465 nm)
(<a class="moz-txt-link-freetext" href="http://en.wikipedia.org/wiki/Light-emitting_diode">http://en.wikipedia.org/wiki/Light-emitting_diode</a>)<br>
<br>
It is principally blue light, around 460 to 480 <a
href="http://en.wikipedia.org/wiki/Nanometre" title="Nanometre">nm</a>,
that suppresses melatonin,<sup id="cite_ref-Brainard_2001_31-0"
class="reference"><a
href="http://en.wikipedia.org/wiki/Melatonin#cite_note-Brainard_2001-31"><span></span></a></sup>
increasingly with increased light intensity and length of exposure.
(<a class="moz-txt-link-freetext" href="http://en.wikipedia.org/wiki/Melatonin">http://en.wikipedia.org/wiki/Melatonin</a>)<br>
<br>
Snížená hladina melatoninu u pracovníků na nočních směnách je
považována za faktor pravděpodobně zodpovědný za zvýšený výskyt <a
href="http://cs.wikipedia.org/wiki/Rakovina" title="Rakovina">rakoviny</a>
u nich. (<a class="moz-txt-link-freetext" href="http://cs.wikipedia.org/wiki/Melatonin">http://cs.wikipedia.org/wiki/Melatonin</a>)<br>
<br>
-m-<br>
<br>
<blockquote
cite="mid:932C4BA36EAC9D4AB8C39461AFD90E4091E4D9@cd00000unlnt050.mail.cd.cz"
type="cite">
<pre wrap="">
Martin.
</pre>
</blockquote>
<br>
</body>
</html>