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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>
<pre class="moz-signature" cols="72">iulian Codreanu, Ph.D.
Director, Nanofabrication Facility
University of Delaware
Harker ISE Lab, Room 163
221 Academy Street
Newark, DE 19716
302-831-2784
<a class="moz-txt-link-freetext" href="https://udnf.udel.edu">https://udnf.udel.edu</a></pre>
<br>
<div class="moz-cite-prefix">On 3/4/2026 5:15 PM, Collins, Deon
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:DM6PR11MB3162E9F2D64612FAE2F7CD47D77CA@DM6PR11MB3162.namprd11.prod.outlook.com">
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Revisiting this older post.</div>
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<br>
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HMNTL has T-8's currently with UV filters. </div>
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<br>
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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.</div>
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<br>
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Superbrightleds T8BDA-30K18A-30PK at 568.50 for a 30 pack </div>
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Vs Superbrightleds T8U4-SW5C22-F-25PK at 199.99 for a 25 pack</div>
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<br>
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<br>
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Thanks in advance. </div>
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<p
style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"
class="elementToProof">
<span style="color: rgb(0, 32, 96);"><b>Deon D. Collins</b></span></p>
<p
style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"
class="elementToProof">
<span style="color: rgb(0, 32, 96);"><b> </b></span></p>
<p
style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"
class="elementToProof">
<span style="color: rgb(0, 32, 96);"><br>
<i>Director of Facilities</i></span></p>
<p
style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"
class="elementToProof">
<span style="color: rgb(0, 32, 96);"><i>The Grainger College
Of Engineering UIUC</i><br>
Holonyak Micro & Nanotechnology Lab</span><span
style="color: rgb(31, 73, 125);"><br>
</span><span style="color: rgb(19, 41, 75);">208 N Wright St
Rm. 1114 | MC-249</span><span
style="color: rgb(31, 73, 125);"><br>
</span><span style="color: rgb(19, 41, 75);">Urbana, IL 61801</span><span
style="color: rgb(31, 73, 125);"><br>
</span><span style="color: rgb(19, 41, 75);">217-300-7531 | </span><span
style="color: rgb(5, 99, 193);"><u><a
style="color: rgb(5, 99, 193); margin-top: 0px; margin-bottom: 0px;"
href="mailto:deonc69@illinois.edu"
moz-do-not-send="true" class="moz-txt-link-freetext">deonc69@illinois.edu</a></u></span><span
style="color: rgb(31, 73, 125);"><br>
<br>
<br>
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style="color: rgb(31, 73, 125); margin-top: 0px; margin-bottom: 0px;"
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<br>
</span><span style="color: rgb(102, 102, 102);"><i>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.
</i></span></p>
<p
style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"
class="elementToProof">
<span style="color: rgb(31, 73, 125);"><u> </u></span></p>
<p
style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"
class="elementToProof">
<span style="font-size: 10pt; color: rgb(163, 35, 139);"><b>Life
begins at the end of your comfort zone.
</b></span></p>
<p
style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"
class="elementToProof">
<span style="font-size: 10pt; color: rgb(163, 35, 139);"><b>
Propeck Amanda</b></span></p>
<p
style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"
class="elementToProof">
</p>
</div>
<hr style="display:inline-block;width:98%" tabindex="-1">
<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif"
style="font-size:11pt" color="#000000"><b>From:</b> labnetwork
<a class="moz-txt-link-rfc2396E" href="mailto:labnetwork-bounces@mtl.mit.edu"><labnetwork-bounces@mtl.mit.edu></a> on behalf of Cohen, Ana
N CTR USARMY DEVCOM ARL (USA) <a class="moz-txt-link-rfc2396E" href="mailto:ana.n.cohen.ctr@army.mil"><ana.n.cohen.ctr@army.mil></a><br>
<b>Sent:</b> Friday, February 17, 2023 9:55 AM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:labnetwork@mtl.mit.edu">labnetwork@mtl.mit.edu</a>
<a class="moz-txt-link-rfc2396E" href="mailto:labnetwork@mtl.mit.edu"><labnetwork@mtl.mit.edu></a>; <a class="moz-txt-link-abbreviated" href="mailto:massey21@llnl.gov">massey21@llnl.gov</a>
<a class="moz-txt-link-rfc2396E" href="mailto:massey21@llnl.gov"><massey21@llnl.gov></a><br>
<b>Subject:</b> Re: [labnetwork] Light filtering in
photolithography bays</font>
<div> </div>
</div>
<div class="BodyFragment"><font size="2"><span
style="font-size:11pt;">
<div class="PlainText">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>
<a
href="https://www.superbrightleds.com/t8-uv-blocking-led-tube-clean-room-18w-1800-"
moz-do-not-send="true" class="moz-txt-link-freetext">https://www.superbrightleds.com/t8-uv-blocking-led-tube-clean-room-18w-1800-</a><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>
<a
href="https://www.uvprocess.com/c3/1790-gamtube-and-supertube-filters.html"
moz-do-not-send="true" class="moz-txt-link-freetext">https://www.uvprocess.com/c3/1790-gamtube-and-supertube-filters.html</a><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: <a class="moz-txt-link-abbreviated" href="mailto:ana.n.cohen.ctr@army.mil">ana.n.cohen.ctr@army.mil</a><br>
<br>
</div>
</span></font></div>
<br>
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