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Hello Frank,<br>
<br>
Typical positive resist (example is AZ1500 series) is photosensitive
in the violet-blue light spectrum and white LEDs have a very strong
blue emission. Your best bet is to use the standard amber filters
or use a single wavelength LED like green or yellow. <br>
<br>
Best Regards,<br>
Brent<br>
<div class="moz-signature"><br>
-- <br>
Brent P. Gila, PhD.<br>
Director, Nanoscale Research Facility<br>
1041 Center Drive<br>
University of Florida<br>
Gainesville, Florida 32611<br>
<a class="moz-txt-link-freetext" href="Tel:352-273-2245">Tel:352-273-2245</a><br>
Fax:352-846-2877<br>
<a class="moz-txt-link-abbreviated" href="mailto:email:bgila@ufl.edu">email:bgila@ufl.edu</a><br>
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<br>
<br>
<br>
<div class="moz-cite-prefix">On 7/7/2017 12:57 PM, Frank Gavin
wrote:<br>
</div>
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<p class="MsoNormal">Hello everyone<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">We are suppliers of wet process equipment
and one of our vendors of HEPA and ULPA fan/filter units tells
us that we do not need to add yellow lens covers over LED
light because such lights do not emit ultraviolet light. I am
always suspicious of simple convenient solutions so I want to
put this statement out to this learned community and learn if
this statement is true. Perhaps some members have experience
using LED lights in photosensitive areas of their fab and
would care to comment?<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Best Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">FRANK GAVIN,
Sales Eng.<o:p></o:p></span></p>
<p class="MsoNormal"><a moz-do-not-send="true"
href="http://www.wafabintl.com/"><span
style="color:windowtext;text-decoration:none"><img
id="_x0000_i1026"
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border="0" width="200"></span></a><span
style="color:windowtext"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:#092F87">6161 Industrial Way,
Livermore CA 94551<br>
<b>(925) 455-5252 ext 2420</b> Fax: (925) 455-5351</span><span
style="font-size:10.0pt"><br>
</span><span style="font-size:10.0pt;color:windowtext"><a
moz-do-not-send="true" href="http://www.wafabintl.com/"><span
style="color:blue">http://www.wafabintl.com</span></a><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:#1F497D">direct dial:
925-800-5551<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:#1F497D">cell (408) 314-6199<o:p></o:p></span></p>
<p class="MsoNormal"><b><span
style="font-size:10.0pt;color:#1F497D"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><b><span
style="font-size:10.0pt;color:#1F497D">Please visit us at:<o:p></o:p></span></b></p>
<p class="MsoNormal"><a moz-do-not-send="true"
href="http://www.semi.org/en/semicon-west-2017"><span
style="color:#1F497D;text-decoration:none"><img
id="Picture_x0020_1"
src="cid:part4.E4789453.E313958D@ufl.edu"
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style="color:windowtext"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span
style="font-size:10.0pt;color:#1F497D"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><b><span
style="font-size:10.0pt;color:#1F497D">July 11<sup>th</sup>
–13<sup>th</sup>
<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span
style="font-size:10.0pt;color:#1F497D">Moscone Center, San
Francisco
</span></b><b><span
style="font-size:10.0pt;color:#37373C;background:white">Booth:
7817 (West Hall)<o:p></o:p></span></b></p>
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<p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
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