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Aaron Collins Profile picture
@masknerd
Jun 14 • 5 tweets • 1 min read Twitter logo Read on Twitter
[1]Synergistic efficacy of dual Far-UVC and blue-light LED Light: The Future of Disinfection
Amanda Gardener, AgResearch Ltd
#ICFUST2023
[2] How well does 222nm, 254nm, 265nm all coupled with 405nm blue LEDs work? Used Feline Infectious Peritonitis Virus as surrogate, along with a saliva solution and put on various surfaces. Based line recovery with control groups and could recapture virus on surfaces deposited
[3] Metal found to have higher disinfection, likely due to reflection. Dried virus harder to inactivates vs wet. With E.Coli surrogate showed some boost with additional exposure to blue LED, notably worked against antibiotic resistant bacteria too. Again all surface focused.
[5] Question: What is the kill mechanism for the blue light? Answer: different mechanism, makes radioactive species.
Question: Is light tolerance of bacteria worrying? Answer: Yes at low energy levels bacteria showed some light tolerance over next generations.
[6] Q: Blue and 254nm? Answer: No boost of blue LED with 254nm or with 265nm.

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More from @masknerd

Aaron Collins Profile picture
Jun 16
[1]Looking to the future of Far-UVC
Catherine Noakes, University of Leeds
@CathNoakes
#ICFUST
#ICFUST2023
[2]written in direct response to the conference (and during the conference) reminder: COVID has caused enormous caseload and death and pre COVID lower respiratory infection was already #4 cause of worldwide death.
[3] This is a huge health challenge worldwide
three vectors for air and infection: communicable diseases( TB measles, flu), opportunistic pathogens (aspergillusm, NTMs, etc), airborne role in other infections (mrsa, c diff, norovirus)
Read 22 tweets
Aaron Collins Profile picture
Jun 16
[1]How it goes forward: A blueprint for communication
with the public about GUV
Kathleen McPhaul, University of Maryland
#ICFUST
#ICFUST2023
[2] (First shout to Balvi for the support on this one! (

Going to address health literacy. The context is the extreme importance of getting the messaging right and letting this space make the change it can
[3] Examples of health messaging that went off track from a public health messaging perspective:
mask effectiveness: they work, they worked, that message was missed. Vaccinations work, but the term "break through" diminished (as opposed to "saving lives, decreasing illness, etc"
Read 24 tweets
Aaron Collins Profile picture
Jun 16
[1] Roundtable discussion with participants from both governmental and non-governmental agencies on future regulatory pathways for Far-UVC
#ICFUST
#ICFUST2023
[2] Moderator: Lew Radonovich (CDC, NIST)
Participants: Belal Abboushi (Pacific Northwest National Laboratory), Aline Heffernan (EPA Office of Pesticide Programs), Cameron Miller (NIST), David Sliney (perspectives from ACGIH), Richard Vincent (perspectives from ASHRAE)
[3] Lew Radonovich (CDC) opens that we will discuss the regulatory space(or really lack of)
NIOSH in US is focused on occupational safety and health, seek knowledge and apply it to the workplace. Will move through the panel now.
Read 25 tweets
Aaron Collins Profile picture
Jun 16
[1] Germicidal Ultraviolet Light dosing
recommendations from the field
PJ Piper, Far UV Technologies
[2] Overview of Upper-Room vs Whole Room(222 nm). Aside: Airplanes hard, need $300M insurance policy so not happening any time soon.
[3] Club Cafe - Boston, MA example install.
Floorplan important, and ceiling heights important.
Originally discussed with clients log kill rate, but will transition to eACH how adjacent industry talk
Read 7 tweets
Aaron Collins Profile picture
Jun 16
[1] Goniophotometric intensity and spectral measurements in the UV for a Care222 Excimer lamp unit with and without a filter and diffuser unit
Rolf S. Bergman, Rolf Bergman Consulting
[2] We care about total photonic output for disinfection. Wanted to explore spectrum impacts off axis, and what happens with difuser.
Lamps: USHIO B1 with and with out filter, and also with added diffuser
[3] Data shows angular difference with and without filters in terms of 222nm output(as expected). Spectral data with off-axis shows reduction in output as well(expected) and the filter reduced light above 235nm which is good.
Read 5 tweets
Aaron Collins Profile picture
Jun 16
[1] Accurate germicidal efficacy and photobiological hazard measurement of far-UVC sources.
Mike Clark, Gigahertz Optik GmbH
#ICFUST2023
#ICFUST
[2] Need better meters especially between fluence and irradiance. UV radiomerters - widely used, convenient
UVspectroradiometers - much more comprehensive
[3] Radiometers often calibrated for near radiation. Most commercial radiometers don't cover the range of Far UV-C. Also need to match spectral response to wavelength of interest or big errors. Knowledge of light source used in calibration is very important!
Read 8 tweets

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