Re: black light

From	Andrew Smallshaw <andrews@sdf.org>
Newsgroups	sci.electronics.misc
Subject	Re: black light
Date	2019-02-13 15:29 +0000
Organization	A noiseless patient Spider
Message-ID	<slrn3rokq68dun.ou7.andrews@sdf.lonestar.org> (permalink)
References	<8cb10a5f-210b-4321-bb3c-dcbf3ae65c8e@googlegroups.com> <q3ta5c$tfr$6@gonzo.alcatraz>

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On 2019-02-12, Jasen Betts <jasen@xnet.co.nz> wrote:
> On 2019-02-11, rdelaney2001@gmail.com <rdelaney2001@gmail.com> wrote:
>> I saw a pocket flashlight in a hardware store yesterday, 
>> it shines UV.  Such a package is new to me.
>>
>> What is it good for?
>
> erasing EPROMs.

One would hope not.  The UV band is generally split into three, UV
A, B and C.  To erase EPROMS you need the UVC, most blacklights,
most blacklights, especially the commodity devices for banknote
checking, UV curing etc are UVA.  UVA is what those insect killing
lamps you see put out, albeit generally in white rather than
blacklight form.  UVC is much shorter wavelength and a massive risk
to your eyes if exposed to it.  Think the kind of masks used for
arc welding.  There is a reason EPROM erasers invariably have safety
lock that cut out if you open the drawer when it is operating.

> a UV light emitting diode.

Could be.  Could be a small fluorescent or a filament bulb.

-- 
Andrew Smallshaw
andrews@sdf.org

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black light rdelaney2001@gmail.com - 2019-02-11 14:53 -0800
  Re: black light Sjouke Burry <burrynulnulfour@ppllaanneett.nnll> - 2019-02-12 00:30 +0100
  Re: black light Jasen Betts <jasen@xnet.co.nz> - 2019-02-12 02:14 +0000
    Re: black light Andrew Smallshaw <andrews@sdf.org> - 2019-02-13 15:29 +0000
      Re: black light Jasen Betts <jasen@xnet.co.nz> - 2019-02-14 05:35 +0000
  Re: black light "J.B. Wood" <arl_123234@hotmail.com> - 2019-02-12 06:35 -0500
  Re: black light Jeff Layman <JMLayman@invalid.invalid> - 2019-02-12 18:43 +0000

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