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Revisiting this older post.</div>
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HMNTL has T-8's currently with UV filters. </div>
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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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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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Thanks in advance. </div>
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<span style="color: rgb(0, 32, 96);"><b>Deon D. Collins</b></span></p>
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<i>Director of Facilities</i></span></p>
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<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">deonc69@illinois.edu</a></u></span><span style="color: rgb(31, 73, 125);"><br>
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<span style="font-size: 10pt; color: rgb(163, 35, 139);"><b> Propeck Amanda</b></span></p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> labnetwork <labnetwork-bounces@mtl.mit.edu> on behalf of Cohen, Ana N CTR USARMY DEVCOM ARL (USA) <ana.n.cohen.ctr@army.mil><br>
<b>Sent:</b> Friday, February 17, 2023 9:55 AM<br>
<b>To:</b> labnetwork@mtl.mit.edu <labnetwork@mtl.mit.edu>; massey21@llnl.gov <massey21@llnl.gov><br>
<b>Subject:</b> Re: [labnetwork] Light filtering in photolithography bays</font>
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<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-">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">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: ana.n.cohen.ctr@army.mil<br>
<br>
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