Comment by SV_BubbleTime
4 hours ago
Along the same lines… where is the proof that as the unit ages it doesn’t leave the magic 220nm range?
It is complete nonsense to point this at people.
4 hours ago
Along the same lines… where is the proof that as the unit ages it doesn’t leave the magic 220nm range?
It is complete nonsense to point this at people.
Here's a paper: https://www.jstage.jst.go.jp/article/lsj/50/7/50_394/_pdf
This is a study of the Ushio Care222 unit, but its underlying physics is the same as any other KrCl excimer lamp, so its pretty implausible for other KrCl lamps to exhibit spectral drift when this one doesn't.
The spectrum does change a bit over time--it actually gets less dangerous. But it's a very slight difference.
So different hardware, a clinical unit designed for thousands of hours.
Vs a very likely Shenzen unit that a teeny tiny group is selling on a basic website. And, you can make zero claims on whether a light spectrum of a led will go up or down over time despite one example. Amplifiers/voltages, coatings wearing down, oxide layers in diodes breaking down, etc.