You Can Just Buy Far-UVC

Re:You Can Just Buy Far-UVC by briandw on Wednesday January 14, 2026 @03:04PM (#46622194)

I looked it up and Far-UVC (typically 222 nm) seems safe-ish. But how do you confirm it's not outputting 254 nm or other wavelengths in the UVA/B range? Seems likely to happen with sloppy production of sources. You really have to trust the filter on the light or verify the frequency somehow.

[ Parent | on HN ]

Re:You Can Just Buy Far-UVC by jefftk on Wednesday January 14, 2026 @03:57PM (#46623256)

(author)

The non-profit OSLUV evaluates lamps and measures their emissions. Here's their evaluation for the Aerolamp, which is the one I've purchased: https://reports.osluv.org/static/assay/aerolamp%20devkit--27...

[ Parent | on HN ]

Re:You Can Just Buy Far-UVC by Retz4o4 on Wednesday January 14, 2026 @05:16PM (#46624517)

OSLUV is fantastic; doing great work.

[ Parent | on HN ]

Re:You Can Just Buy Far-UVC by Bad_Initialism on Wednesday January 14, 2026 @05:35PM (#46624817)

Well, just use your USB spectrometer, of course.

...you do have a USB spectrometer, don't you?

I have mine in my bedside drawer. I use it almost as often as my multimeter.

[ Parent | on HN ]

Re:You Can Just Buy Far-UVC by philipkglass on Wednesday January 14, 2026 @05:51PM (#46625058)

Does yours measure wavelengths that short? A lot of low cost spectrometers don't, because inexpensive glass and plastic optics transmit visible and near-IR radiation but significantly impair shorter UV wavelengths.

[ Parent | on HN ]

Re:You Can Just Buy Far-UVC by briandw on Wednesday January 14, 2026 @05:41PM (#46624911)

I need to get one :)

[ Parent | on HN ]

Re:You Can Just Buy Far-UVC by ansgri on Thursday January 15, 2026 @11:31AM (#46635049)

Do you have a recommendation for an inexpensive one? I’ve worked with OceanOptics Flame series, but they’re not exactly cheap, and their software was crap.

[ Parent | on HN ]