I suspect that they're just UV lights without the visible spectrum
filter
that makes the others "black lights".-
Germicidal lamps are made out of quartz, to let the shortwave
(nasty) UV through. Black lights are glass, IIRC, and also have
the visible light filter. SWUV is ionizing, and makes cataracts.
LWUV makes for a trippy session listening to old vinyl records.
-- Jim
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