Judy Seigel (jseigel@panix.com)
Sat, 30 Jan 1999 11:30:33 -0500 (EST)
Walt, you don't give the source of your citation on UV hazards, but
whatever it is you are due thanks for the info, a welcome draft of sense &
data in an area of uncertainty, not to mention hysterics. Some folks have
advised *leaving the room* when the UV light is on, others have cited
symptoms that had to be entirely unrelated.
One manufacturer I spoke to said the bulbs are safe at a distance of
more than 40 inches; I myself have always assumed that eyeglasses give the
protection stated for glass. But I do use a pair of supposedly UV-proof
goggles (bought from American Science & Surplus for $4) for extended
burning or dodging. It occurs to me in light of your story about false
claims to test them -- I thought of putting them on top of an emulsion and
exposing, to see the difference. Any comments?
Judy
On Fri, 29 Jan 1999, Walt Goettman wrote:
> > SOME WAYS TO REDUCE UV HAZARDS
> > ------------------------------
> >
> > UVB and UVC, as well as the shortest UVA wavelengths, do not go through ordinary glass. Even
> > Pyrex and other more ordinary forms of heat-resistant glass can be used as shields to block UVB
> > and UVC.
> >
> > Another option is to contain all light from the suspect source. For example, EPROM erasers often
> > have an interlock switch to prevent operation with the lamp exposed.
> >
> > In the event you need something transparant to visible light (and most infrared) but which blocks all
> > UVC, UVB, and well over 95 percent of UVA, use a GAM ("Great American Market") number
> > 1510 (UV shield) filter gel. This is available from some theatrical supply shops. If very severe
> > exposure is anticipated, the filter gel should be preceded by glass.
> >
>
> Check out http://www.misty.com/~don/light.html for this and lots of
> other light source info.
>
> Walt
>
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