<div dir="ltr"><div dir="ltr"><div><div class="gmail_default" style="font-family:arial,sans-serif">Deon,</div><div class="gmail_default" style="font-family:arial,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,sans-serif">When we converted our fab from fluorescent to LED several years ago we used the following T8 size LED lamps, and installed yellow sleeves over the ones that were in our photolithography spaces. We looked at the yellow LED, but when we did the testing, and price comparison, there wasn't any difference in wavelength filtering, and the yellow LED's were about 3 times the cost. At the time it made way more sense to just use a white LED, and install a filter tube over the lamp. That allowed for a lot of flexibility. and keeps us with only one bulb to have to worry about keeping on hand for replacement.</div><div class="gmail_default" style="font-family:arial,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,sans-serif">The only problems we've had since then is making sure all of our fluorescent fixtures get converted to single-ended as we change them (we did all of the lamps in the entire facility as part of this LED push), and making sure we stay with the same temperature range.</div><div class="gmail_default" style="font-family:arial,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,sans-serif">We have some lamps that have been on continuously since May of 2017. That's over 78,000 hours.</div><div class="gmail_default" style="font-family:arial,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,sans-serif"><span style="color:rgb(51,51,51);font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:14px;background-color:rgb(255,255,255)">GREEN CREATIVE GREEN 36973 16T8 4F BYP RC LED LAMP (LED lamp, direct wire), 4000K, single ended, 4 foot length</span></div><div class="gmail_default" style="font-family:arial,sans-serif"><span style="color:rgb(51,51,51);font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:14px;background-color:rgb(255,255,255)"><br></span></div><div class="gmail_default" style="font-family:arial,sans-serif"><span style="color:rgb(51,51,51);font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:14px;background-color:rgb(255,255,255)">Tarp50 light filter</span></div><div class="gmail_default" style="font-family:arial,sans-serif"><span style="color:rgb(51,51,51);font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:14px;background-color:rgb(255,255,255)"><br></span></div><div class="gmail_default" style="font-family:arial,sans-serif"><span style="color:rgb(51,51,51);font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:14px;background-color:rgb(255,255,255)">Thanks,</span></div><br clear="all"></div><div><div dir="ltr" class="gmail_signature"><div>Dennis<span class="gmail_default" style="font-family:arial,sans-serif"> Schweiger</span></div><div><span class="gmail_default" style="font-family:arial,sans-serif">University of Michigan/LNF</span></div><div><div class="gmail_default" style="font-family:arial,sans-serif">Facilities<span style="font-family:Arial,Helvetica,sans-serif"> </span></div></div><div>734.647.2055 Ofc</div></div></div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Wed, Mar 4, 2026 at 8:08 PM Collins, Deon <<a href="mailto:deonc69@illinois.edu">deonc69@illinois.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg3861619855489689292">
<div dir="ltr">
<div style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">
Revisiting this older post.</div>
<div style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">
<br>
</div>
<div style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">
HMNTL has T-8's currently with UV filters. </div>
<div style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">
<br>
</div>
<div style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">
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>
<div style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">
<br>
</div>
<div style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">
Superbrightleds T8BDA-30K18A-30PK at 568.50 for a 30 pack </div>
<div style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">
Vs Superbrightleds T8U4-SW5C22-F-25PK at 199.99 for a 25 pack</div>
<div style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">
<br>
</div>
<div style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">
<br>
</div>
<div style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">
Thanks in advance. </div>
<div id="m_3861619855489689292Signature">
<div style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">
<br>
</div>
<p style="margin:0in;font-family:Calibri,sans-serif;font-size:11pt">
<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">
<span style="color:rgb(0,32,96)"><b> </b></span></p>
<p style="margin:0in;font-family:Calibri,sans-serif;font-size:11pt">
<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">
<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" target="_blank">deonc69@illinois.edu</a></u></span><span style="color:rgb(31,73,125)"><br>
<br>
<br>
<u><a style="color:rgb(31,73,125);margin-top:0px;margin-bottom:0px" href="http://illinois.edu/" target="_blank"><img style="width: 1.239in; height: 0.218in; margin-top: 0px; margin-bottom: 0px;" height="20" width="118" alt="https://webtools.illinois.edu/webservices/js/ds/signature_logo.png" src="cid:ii_19cbf1ba8b07df41abd1"></a></u><br>
<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">
<span style="color:rgb(31,73,125)"><u> </u></span></p>
<p style="margin:0in;font-family:Calibri,sans-serif;font-size:11pt">
<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">
<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">
</p>
</div>
<div id="m_3861619855489689292appendonsend"></div>
<hr style="display:inline-block;width:98%">
<div id="m_3861619855489689292divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> labnetwork <<a href="mailto:labnetwork-bounces@mtl.mit.edu" target="_blank">labnetwork-bounces@mtl.mit.edu</a>> on behalf of Cohen, Ana N CTR USARMY DEVCOM ARL (USA) <<a href="mailto:ana.n.cohen.ctr@army.mil" target="_blank">ana.n.cohen.ctr@army.mil</a>><br>
<b>Sent:</b> Friday, February 17, 2023 9:55 AM<br>
<b>To:</b> <a href="mailto:labnetwork@mtl.mit.edu" target="_blank">labnetwork@mtl.mit.edu</a> <<a href="mailto:labnetwork@mtl.mit.edu" target="_blank">labnetwork@mtl.mit.edu</a>>; <a href="mailto:massey21@llnl.gov" target="_blank">massey21@llnl.gov</a> <<a href="mailto:massey21@llnl.gov" target="_blank">massey21@llnl.gov</a>><br>
<b>Subject:</b> Re: [labnetwork] Light filtering in photolithography bays</font>
<div> </div>
</div>
<div><font size="2"><span style="font-size:11pt">
<div>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-" target="_blank">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" target="_blank">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 href="mailto:ana.n.cohen.ctr@army.mil" target="_blank">ana.n.cohen.ctr@army.mil</a><br>
<br>
</div>
</span></font></div>
</div>
_______________________________________________<br>
labnetwork mailing list<br>
<a href="mailto:labnetwork@mtl.mit.edu" target="_blank">labnetwork@mtl.mit.edu</a><br>
<a href="https://mtl.mit.edu/mailman/listinfo.cgi/labnetwork" rel="noreferrer" target="_blank">https://mtl.mit.edu/mailman/listinfo.cgi/labnetwork</a><br>
</div></blockquote></div></div>