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<p class="MsoNormal"><a name="x__MailAutoSig"><span style="font-size:11.0pt">We use recessed 3500k LEDs with UV filter covers.<o:p></o:p></span></a></p>
<p class="MsoNormal"><span style="mso-bookmark:x__MailAutoSig"><span style="font-size:11.0pt"><o:p> </o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:x__MailAutoSig"><span style="font-size:11.0pt">No reported issues in 9 years.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:x__MailAutoSig"><span style="font-size:11.0pt"><o:p> </o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:x__MailAutoSig"><span style="font-size:11.0pt">Best,<o:p></o:p></span></span></p>
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<p class="MsoNormal" style="background:white"><span style="mso-bookmark:x__MailAutoSig"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Nick Menounos, </span></b></span><span style="mso-bookmark:x__MailAutoSig"></span><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">PE</span><o:p></o:p></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black">MIT.nano - Associate Director of Infrastructure</span><o:p></o:p></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black">Cell: </span><span style="color:black"><a href="tel:+15089320938"><span style="font-size:9.0pt;font-family:"Arial",sans-serif">(508) 932-0938</span></a></span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"> </span><span style="font-size:11.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> labnetwork <labnetwork-bounces@mtl.mit.edu>
<b>On Behalf Of </b>Iulian Codreanu<br>
<b>Sent:</b> Thursday, March 5, 2026 7:55 AM<br>
<b>To:</b> Collins, Deon <deonc69@illinois.edu>; Cohen, Ana N CTR USARMY DEVCOM ARL (USA) <ana.n.cohen.ctr@army.mil>; labnetwork@mtl.mit.edu; massey21@llnl.gov<br>
<b>Subject:</b> Re: [labnetwork] Light filtering in photolithography bays<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi Deon,<br>
<br>
I went with the white LEDs + UV filters after evaluating a number of amber LEDs that did not quite filter as expected.<br>
<br>
<br>
<o:p></o:p></p>
<pre>iulian Codreanu, Ph.D.<o:p></o:p></pre>
<pre>Director, Nanofabrication Facility<o:p></o:p></pre>
<pre>University of Delaware<o:p></o:p></pre>
<pre>Harker ISE Lab, Room 163<o:p></o:p></pre>
<pre>221 Academy Street<o:p></o:p></pre>
<pre>Newark, DE 19716<o:p></o:p></pre>
<pre>302-831-2784<o:p></o:p></pre>
<pre><a href="https://udnf.udel.edu">https://udnf.udel.edu</a><o:p></o:p></pre>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On 3/4/2026 5:15 PM, Collins, Deon wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="color:black">Revisiting this older post.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black">HMNTL has T-8's currently with UV filters. <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Before I pull the trigger on filtered LED replacements, I want to make an inquiry. I am contemplating purchasing nonfiltered LEDs and reusing the UV filters from our CFL bulbs. Being we have 8 photolithography
labs; initial conservative savings look to be around $5000.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Superbrightleds T8BDA-30K18A-30PK at 568.50 for a 30 pack <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Vs Superbrightleds T8U4-SW5C22-F-25PK at 199.99 for a 25 pack<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Thanks in advance. <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="elementtoproof"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060">Deon D. Collins</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="elementtoproof"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060"> </span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="elementtoproof"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060"><br>
<i>Director of Facilities</i></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="elementtoproof"><i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060">The Grainger College Of Engineering UIUC</span></i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060"><br>
Holonyak Micro & Nanotechnology Lab</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><br>
</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#13294B">208 N Wright St Rm. 1114 | MC-249</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><br>
</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#13294B">Urbana, IL 61801</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><br>
</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#13294B">217-300-7531 |
</span><a href="mailto:deonc69@illinois.edu"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#0563C1">deonc69@illinois.edu</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><br>
<br>
<br>
</span><a href="http://illinois.edu/"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;text-decoration:none"><img border="0" width="118" height="20" style="width:1.2291in;height:.2083in" id="Picture_x0020_1" src="cid:image001.png@01DCACA3.03398420"></span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><br>
<br>
</span><i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#666666">Under the Illinois Freedom of Information Act any written communication to or from university employees regarding university business is a public record and may be subject
to public disclosure. </span></i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="elementtoproof"><u><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span></u><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="elementtoproof"><b><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#A3238B">Life begins at the end of your comfort zone.
</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="elementtoproof"><b><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#A3238B"> Propeck Amanda</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="elementtoproof"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"> labnetwork
</span><a href="mailto:labnetwork-bounces@mtl.mit.edu"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><labnetwork-bounces@mtl.mit.edu></span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"> on behalf of Cohen,
Ana N CTR USARMY DEVCOM ARL (USA) </span><a href="mailto:ana.n.cohen.ctr@army.mil"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><ana.n.cohen.ctr@army.mil></span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"><br>
<b>Sent:</b> Friday, February 17, 2023 9:55 AM<br>
<b>To:</b> </span><a href="mailto:labnetwork@mtl.mit.edu"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">labnetwork@mtl.mit.edu</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">
</span><a href="mailto:labnetwork@mtl.mit.edu"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><labnetwork@mtl.mit.edu></span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">;
</span><a href="mailto:massey21@llnl.gov"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">massey21@llnl.gov</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">
</span><a href="mailto:massey21@llnl.gov"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><massey21@llnl.gov></span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"><br>
<b>Subject:</b> Re: [labnetwork] Light filtering in photolithography bays</span> <o:p>
</o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:11.0pt">Hi Travis,<br>
<br>
A couple years ago we switched our lithography bay fluorescents (T8) to<br>
amber tube LEDS from Super Bright LEDs. The light is more orange than yellow<br>
so took a little adjusting (many users first thought it was darker than<br>
usual), but visibility has actually been much better since we these bulbs<br>
are more stable and we don't end up with dark patches from dead<br>
fluorescents.<br>
</span><a href="https://www.superbrightleds.com/t8-uv-blocking-led-tube-clean-room-18w-1800-"><span style="font-size:11.0pt">https://www.superbrightleds.com/t8-uv-blocking-led-tube-clean-room-18w-1800-</span></a><span style="font-size:11.0pt"><br>
lumens-single-end-dual-end-ballast-bypass-type-b-32w-equivalent-1800k+packam<br>
t-30-Pack <br>
<br>
Our fume hoods are still fluorescent bulbs with filters. I've definitely<br>
noticed a degredation over time, but our facilities also have purchased<br>
different filters over the years, so I can't provide much comparison to your<br>
situation. However, it may be that your LEDS are emitting higher wavelengths<br>
than the fluorescents. UV Process has UV filters along with the color tubes<br>
which could be useful<br>
</span><a href="https://www.uvprocess.com/c3/1790-gamtube-and-supertube-filters.html"><span style="font-size:11.0pt">https://www.uvprocess.com/c3/1790-gamtube-and-supertube-filters.html</span></a><span style="font-size:11.0pt"><br>
<br>
We don't filter our computer screens because don't notice much light<br>
pollution and we don't keep anything photosensitive nearby long-term, but<br>
you can definitely turn down the brightness and blue saturation on the<br>
monitors. We also have not needed to replace the darker pigment filters on<br>
our doors' windows, but similar to the monitors they are placed sufficiently<br>
distant from the photoresists/coated substrates.<br>
<br>
Good luck!<br>
Ana<br>
<br>
--<br>
Ana N. Cohen [she/her/hers]<br>
Photolithography Cleanroom Technician<br>
Contractor | General Technical Services, LLC<br>
US Army Research Laboratory<br>
2800 Powder Mill Road, Adelphi, MD 20783<br>
Tel: 301-394-1527<br>
Email: </span><a href="mailto:ana.n.cohen.ctr@army.mil"><span style="font-size:11.0pt">ana.n.cohen.ctr@army.mil</span></a><span style="font-size:11.0pt"><o:p></o:p></span></p>
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<o:p></o:p></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>labnetwork mailing list<o:p></o:p></pre>
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