[labnetwork] Light filtering in photolithography bays

[Collins, Deon]

Revisiting this older post.

HMNTL has T-8's currently with UV filters.

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.

Superbrightleds T8BDA-30K18A-30PK at 568.50 for a 30 pack
Vs Superbrightleds T8U4-SW5C22-F-25PK at 199.99 for a 25 pack


Thanks in advance.


Deon D. Collins



Director of Facilities

The Grainger College Of Engineering UIUC
Holonyak Micro & Nanotechnology Lab
208 N Wright St Rm. 1114 | MC-249
Urbana, IL 61801
217-300-7531 | deonc69 at illinois.edu<mailto:deonc69 at illinois.edu>


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________________________________
From: labnetwork <labnetwork-bounces at mtl.mit.edu> on behalf of Cohen, Ana N CTR USARMY DEVCOM ARL (USA) <ana.n.cohen.ctr at army.mil>
Sent: Friday, February 17, 2023 9:55 AM
To: labnetwork at mtl.mit.edu <labnetwork at mtl.mit.edu>; massey21 at llnl.gov <massey21 at llnl.gov>
Subject: Re: [labnetwork] Light filtering in photolithography bays

Hi Travis,

A couple years ago we switched our lithography bay fluorescents (T8) to
amber tube LEDS from Super Bright LEDs. The light is more orange than yellow
so took a little adjusting (many users first thought it was darker than
usual), but visibility has actually been much better since we these bulbs
are more stable and we don't end up with dark patches from dead
fluorescents.
https://www.superbrightleds.com/t8-uv-blocking-led-tube-clean-room-18w-1800-
lumens-single-end-dual-end-ballast-bypass-type-b-32w-equivalent-1800k+packam
t-30-Pack

Our fume hoods are still fluorescent bulbs with filters. I've definitely
noticed a degredation over time, but our facilities also have purchased
different filters over the years, so I can't provide much comparison to your
situation. However, it may be that your LEDS are emitting higher wavelengths
than the fluorescents. UV Process has UV filters along with the color tubes
which could be useful
https://www.uvprocess.com/c3/1790-gamtube-and-supertube-filters.html

We don't filter our computer screens because don't notice much light
pollution and we don't keep anything photosensitive nearby long-term, but
you can definitely turn down the brightness and blue saturation on the
monitors. We also have not needed to replace the darker pigment filters on
our doors' windows, but similar to the monitors they are placed sufficiently
distant from the photoresists/coated substrates.

Good luck!
Ana

--
Ana N. Cohen [she/her/hers]
Photolithography Cleanroom Technician
Contractor | General Technical Services, LLC
US Army Research Laboratory
2800 Powder Mill Road, Adelphi, MD 20783
Tel: 301-394-1527
Email: ana.n.cohen.ctr at army.mil

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