UV light for kids room?
dmc
Decorating my sons (2.5 yr old) room and suddenly had a thought...
He love glow-in-the-dark things. Ceiling is covered in sharks and
cows (don't ask) that glow in the dark for a while when they have
been exposed to bright light for a while. You know the type - they
are plastic and a sortof yellow-green colour.
Anyway...
When you see these things for sale in shops they are often glowing
brightly under some sort of UV (AFAIK) light. Now all I remember
from my electronics/physics days is that UV light is not good and
that eprom erasers shouldn't be looked at. This is obviously different
to the UV that I see in shop displays (UVA and UVB rings bells...).
What I would like to do would be to get a normal cheapo uplighter.
stick it to the wall and stick a UV bulb into it. Something like
KJ64U from maplin.co.uk for example.
Will this work? If so is it a sensible idea or are there bad things
likely to happen with this much UV exposure (i'm guessing that this
is nothing compared to the suns output).
If it won't work then can anyone suggest something that would? I know
the shop displays use some sort of flourescent tube but ideally I would
like to be able to dim this light using a normal dimmer switch (I
assume there would be no problems with this?). I'm looking at flooding
the ceiling really although if I could just light the room in UV with
no side effects then even better!
Anyone else done something similar?
Cheers,
Darren
Steve
> Decorating my sons (2.5 yr old) room and suddenly had a thought...
>
> He love glow-in-the-dark things. Ceiling is covered in sharks and
> cows (don't ask) that glow in the dark for a while when they have
> been exposed to bright light for a while. You know the type - they
> are plastic and a sortof yellow-green colour.
I bet you could kick the response you need with the UV leds from Nichia
- the room will be dark enough that the leds will have more than enough
power.
Steve
Colin Wilson
> cows (don't ask) that glow in the dark for a while when they have
> been exposed to bright light for a while. You know the type - they
> are plastic and a sortof yellow-green colour.
There`s a site somewhere (linked from an advert on www.filesoup.com IIRC
but I can`t see the advert there atm) where you can buy some sort of
flourescent paint which is practically invisible under normal light, but
looks great under UV ;-)
Failing that, there`s always something like...
http://www.glowinc.com/paint.htm
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The Natural Philosopher
>>He love glow-in-the-dark things. Ceiling is covered in sharks and
>>cows (don't ask) that glow in the dark for a while when they have
>>been exposed to bright light for a while. You know the type - they
>>are plastic and a sortof yellow-green colour.
>>
>
> There`s a site somewhere (linked from an advert on www.filesoup.com IIRC
> but I can`t see the advert there atm) where you can buy some sort of
> flourescent paint which is practically invisible under normal light, but
> looks great under UV ;-)
>
> Failing that, there`s always something like...
>
> http://www.glowinc.com/paint.htm
>
>
First of all, do make sure your black light can't be looked at straight.
It will lead to conjunctivitis with prolonged exposure.
Fluorescent paints are available. I suggest you google on 'black light';
and Disco effects' and so on, because thats where we used to use it.
Dayglo paints sometimes are UV reactive. Craft shops stock em.
Dave Liquorice
> ... glow in the dark for a while when they have been exposed to
> bright light for a while. You know the type - they are plastic and a
> sortof yellow-green colour.
Just had a quick play with low powered(?) UV source and No.1 Daughters
bedroom (she is away...) which has a few glow-in-the-dark stars an
moons. The UV source was a battery powered security type (came with a
couple of UV flourescent marker pens).
The things that really kicked off contained optical brighteners (white
photcopier paper etc). The glow in the dark things didn't show from a
distance but the UV lamp when bought close really charged them up
well.
As to the amount of UV coming from this lamp I haven't a clue. Nor
about any problems of long term exposure.
--
Cheers new...@howhill.com
Dave. pam is missing e-mail
The Natural Philosopher
> On Mon, 27 Oct 03 21:13:39 GMT, dmc wrote:
>
>
>>... glow in the dark for a while when they have been exposed to
>>bright light for a while. You know the type - they are plastic and a
>>sortof yellow-green colour.
>>
>
> Just had a quick play with low powered(?) UV source and No.1 Daughters
> bedroom (she is away...) which has a few glow-in-the-dark stars an
> moons. The UV source was a battery powered security type (came with a
> couple of UV flourescent marker pens).
>
> The things that really kicked off contained optical brighteners (white
> photcopier paper etc). The glow in the dark things didn't show from a
> distance but the UV lamp when bought close really charged them up
> well.
Thats because they work by absorbing light in the visible spectrum and
re-emittining it later. I have a T-shirt like this.
That's not fluorescence, its summat else.
True fluorescence is from phosphors and other strange chemicals. They
aborb UV and re-emit visible. Paint loaded with that glows under UV.
I wish you took my advice to google
What you want is here
http://www.dialsoundlight.co.uk/d-commerce/page3.html
and here
http://www.thesensorycompany.co.uk/catalog/ProductDetails.aspx?productID=17
and here
http://www.thesensorycompany.co.uk/catalog/ProductDetails.aspx?productID=12
and so on ad nauseam
Just google on black light fluorescent paint.
Andy Dingley
wrote:
>True fluorescence is from phosphors and other strange chemicals. They
>aborb UV and re-emit visible.
Fluorescence is immediate, phosphoresence has a time delay.
From physics, either of them can work from absorbing any wavelength to
emitting any wavelength, except that the wavelength must get longer.
From chemistry, to find something that emits visible light needs
something that absorbs at the UV or at least blue end of the spectrum.
Almost all of the cheap stuff is zinc sulphide, which gives that
"halloween green" colour. It's a lousy phosphor, but it's cheap.
--
Die Gotterspammerung - Junkmail of the Gods
N. Thornton
> Colin Wilson wrote:
>
> >>He love glow-in-the-dark things. Ceiling is covered in sharks and
> >>cows (don't ask) that glow in the dark for a while when they have
> >>been exposed to bright light for a while. You know the type - they
> >>are plastic and a sortof yellow-green colour.
> First of all, do make sure your black light can't be looked at straight.
> It will lead to conjunctivitis with prolonged exposure.
Hi
Firstly Ultraviolet light does damage eyesight. It can cause blindness
if misused, and it it very easy to misuse it without reailsing what
one is doing. Real uv is not something I would be putting in a kids
bedroom.
Pointing the thing upwards is obviously not going to work, as kids are
inquisitive, and he/she will climb up and peer into it, eyes wide open
in the dark, and all of 6" from the light.
Some types of UV source are real nasty, some are much less so. In
short this plan is not a good one.
What is less well known is that flourescent and phosphorescent things
do not require UV to glow, all they need is a light with a higher
frequency colour than they emit. So something that glows yellow or
green would work well with blue light. Blue ilght, unlike uv, is safe.
It is thus the obvious choice.
Blue filament bulbs are very inefficient, blue fluorescent tubes are
much better.
Regards, NT
Owain
| Decorating my sons (2.5 yr old) room and suddenly had a thought...
| He love glow-in-the-dark things. Ceiling is covered in sharks and
| cows (don't ask) that glow in the dark for a while when they have
| been exposed to bright light for a while. You know the type - they
| are plastic and a sortof yellow-green colour.
That's luminous. They fade gently over a period of time and are supposed to
be restful and reassuring. I had glow-stars except I had to wait until I was
old enought to stick them to the ceiling myself :-(
| When you see these things for sale in shops they are often glowing
| brightly under some sort of UV (AFAIK) light.
Those are fluorescent. UV light will cause anything that is washed with
optical brighteners to fluoresce, including the bedcovers, pyjamas, etc. I
think this effect might be rather more appropriate in a discotheque than a
small child's bedroom :-)
Owain
Dave Liquorice
>> The glow in the dark things didn't show from a distance but the UV
>> lamp when bought close really charged them up well.
>
> Thats because they work by absorbing light in the visible spectrum
> and re-emittining it later.
Erm there is naff all visible light from this UV security illuminator.
Plenty of UV and that is absorbed and re-emitted in the visible range.
B-)
> I wish you took my advice to google
No need I'm not the OP. I just did a bit of research about UV and the
glow in the dark things, they don't glow as he would like them to.
dmc
Owain <Use owain to email me.> wrote:
>That's luminous. They fade gently over a period of time and are supposed to
>be restful and reassuring. I had glow-stars except I had to wait until I was
>old enought to stick them to the ceiling myself :-(
Thats the ones.
>| When you see these things for sale in shops they are often glowing
>| brightly under some sort of UV (AFAIK) light.
>Those are fluorescent.
Maybe - but I am talking about the same bits of plastic. Several local
shops sell these luminous stars etc - they have them on a stand with
what I assume is a UV fluorescent tube over the top. There is some
fluorescent paint on the stand but the stars themselves certainly
appear to glow. I guess they are luminous and fluorescent.
> UV light will cause anything that is washed with
>optical brighteners to fluoresce, including the bedcovers, pyjamas, etc. I
>think this effect might be rather more appropriate in a discotheque than a
>small child's bedroom :-)
From school discos many moons back I seem to remeber that dandruff can
glow quite well as well :-)
Darren
dmc
N. Thornton <big...@meeow.co.uk> wrote:
>Firstly Ultraviolet light does damage eyesight. It can cause blindness
>if misused, and it it very easy to misuse it without reailsing what
>one is doing. Real uv is not something I would be putting in a kids
>bedroom.
Fair enough. I take it that disco lights and the things on glow-in-the-dark
displays in shops are UV but rely on the fact that people are not looking
at them for hours on end (although I wonder how shop workers stand on
this...). Or maybe they are not UV after all - they certainly looklike
it and they give out very little visable light.
>Pointing the thing upwards is obviously not going to work, as kids are
>inquisitive, and he/she will climb up and peer into it, eyes wide open
>in the dark, and all of 6" from the light.
>
>Some types of UV source are real nasty, some are much less so. In
>short this plan is not a good one.
Is something that is used in disco lighting likely to be ok or are
these things just "less bad"? I noticed that one of the Safeway stores
in Canterbury now uses UV lighting in the loos (and this is not to
make things glow :-) - again, I guess it isn't somewhere you would
be hanging around for long.
>What is less well known is that flourescent and phosphorescent things
>do not require UV to glow, all they need is a light with a higher
>frequency colour than they emit. So something that glows yellow or
>green would work well with blue light. Blue ilght, unlike uv, is safe.
>It is thus the obvious choice.
>Blue filament bulbs are very inefficient, blue fluorescent tubes are
>much better.
Interesting. Maybe I will take a look at the lights that are meant to
be fitted in PCs - nice and small and reasonably cheap.
Hmmm..
Darren
John
Corsa's) are difficult to focus on? (Red to a lesser degree)
--
Regards
John
"dmc" <D.M.C...@ukc.ac.uk> wrote in message news:52...@heron.ukc.ac.uk...
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The Natural Philosopher
> I
> think this effect might be rather more appropriate in a discotheque than a
> small child's bedroom :-)
>
There is a difference?
> Owain
>
>
>
Suz
dave @ stejonda
<john.plant90@NO-SPAMntlworldDOTcom.?.invalid> writes
>A bit off topic - but why do I find that Blue LEDs (washer jets on the
>kids Corsa's) are difficult to focus on? (Red to a lesser degree)
age
--
dave @ stejonda
Dave Liquorice
> A bit off topic - but why do I find that Blue LEDs (washer jets on
> the kids Corsa's) are difficult to focus on?
Blue light refracts or bends more than red light when passing through
different density substances. This means the cornea and lens in your
eye bends the blue light to much causing it to be out of focus on the
retina.
Age and hardening of the lens may make this worse I guess.
N. Thornton
> >Firstly Ultraviolet light does damage eyesight. It can cause blindness
> >if misused, and it it very easy to misuse it without reailsing what
> >one is doing. Real uv is not something I would be putting in a kids
> >bedroom.
> Fair enough. I take it that disco lights and the things on glow-in-the-dark
> displays in shops are UV but rely on the fact that people are not looking
> at them for hours on end (although I wonder how shop workers stand on
> this...). Or maybe they are not UV after all - they certainly looklike
> it and they give out very little visable light.
Disco blacklights are lowest frequency uv plus visible violet, and are
low power, the light source is spread out along the length of a low
power tube, and there are warnings to mount them so they arent seen
directly, to use them for limited times, and to use them with other
lighting on. These warnings are not necessarily all heeded of course.
At the other end of the scale there are uv sources that are short
wavelength, intense, and accompanied by no visible light. Sources ilke
this can cause immediate blindness. I've worked with 1.6kW uv sources,
and before I was there, there was someone who caught a glimpse of the
arc and was [temporarily] blinded instantly. He got to see again later
that day. Believe me, uv sources like that hurt!
The problem with using a blacklight in a kids room is that the kid is
not going to take any notice of the safety issues, and will probably
stick their nose on it sooner or later, with dark-accustomed eyes. The
result can be swelling and inflammation of the back of the eye,
temporary blindness, pain, and detachment of the retina from the eye.
Its known as snow-blindness, and it is possible for it to cause
permanent and considerable damage.
> >Pointing the thing upwards is obviously not going to work, as kids are
> >inquisitive, and he/she will climb up and peer into it, eyes wide open
> >in the dark, and all of 6" from the light.
> >
> >Some types of UV source are real nasty, some are much less so. In
> >short this plan is not a good one.
> Is something that is used in disco lighting likely to be ok or are
> these things just "less bad"?
Far less bad than some sources. But, see above.
> I noticed that one of the Safeway stores
> in Canterbury now uses UV lighting in the loos (and this is not to
> make things glow :-) - again, I guess it isn't somewhere you would
> be hanging around for long.
you cant see ultraviolet, its invisible. I dont know what they've got
but it might well be violet rather than ultraviolet.
Regards, NT
Fishter
In removethis<news:a7076635.0310...@posting.google.com> you
wrote:
>> I noticed that one of the Safeway stores
>> in Canterbury now uses UV lighting in the loos (and this is not to
>> make things glow :-) - again, I guess it isn't somewhere you would
>> be hanging around for long.
>
> you cant see ultraviolet, its invisible. I dont know what they've got
> but it might well be violet rather than ultraviolet.
Apparently it prevents people being abel to see their veins..... i.e. they
can't find somewhere to inject anything. Might be a bit extreme in a
supermarket toilet, but I've not been to Canterbury!
--
Fishter
unhook to mail me | http://www.fishter.org.uk/
You make me realise that happiness is a belt-fed weapon
dmc
Fishter <nt...@hook.fishter.org.uk> wrote:
>Apparently it prevents people being abel to see their veins..... i.e. they
>can't find somewhere to inject anything. Might be a bit extreme in a
>supermarket toilet, but I've not been to Canterbury!
Indeed.
Its not in the best bit of Canterbury but still surprised me that they have
had much of a problem there. Still, despite the signs claiming that this
is UV lighting it is a faily deep violet colour.
Darren
Fishter
In removethis<news:52...@heron.ukc.ac.uk> you wrote:
> Still, despite the signs claiming that this
> is UV lighting it is a faily deep violet colour.
ISTR that UV lamps are generally designed to emit some light at the top end
of the visible spectrum. This is an aid to the "Is it on?" type of fault finding.
;-)
--
Fishter
unhook to mail me | http://www.fishter.org.uk/
I bet you wear that pony tail to cover up your valve stem
dmc
>Disco blacklights are lowest frequency uv plus visible violet, and are
>low power, the light source is spread out along the length of a low
>power tube, and there are warnings to mount them so they arent seen
>directly, to use them for limited times, and to use them with other
>lighting on. These warnings are not necessarily all heeded of course.
Fair enough. I think I am convinced that this is not a smart idea.
Interestingly, I was in Woolworths this morning and they are selling
a "UV" cd rack. This is a fluorescent tube that glows a deep purple
in the middle of a load of plastic that "glows".
Also,away from the tube idea maplin are selling a "black light UV bulb"
that fits normal ES or BC fittings. The chap in the shop reckons that
it is a normal 75 watt bulb with glass that just filters all but the
violet and UV end and that the UV from it is no worse than the UV from
any normal lightbulb. The blurb on the website states "A standard size
light bulb with a special coating that produces a deep purple light and
large amounts of Ultra Violet light"
Which is most likely? I assume that there are magic coatings that could
convert visable to UV in which case this is not a good idea. If however
it really is a normal bulb with a filter then I guess its no worse than
any other bulb would be. Code KJ64U for example.
>At the other end of the scale there are uv sources that are short
>wavelength, intense, and accompanied by no visible light. Sources ilke
>this can cause immediate blindness. I've worked with 1.6kW uv sources,
>and before I was there, there was someone who caught a glimpse of the
>arc and was [temporarily] blinded instantly. He got to see again later
>that day. Believe me, uv sources like that hurt!
Blimey. 1.6kW visable source would be pretty blinding I would have
thought! Out of interest, can I ask what this sort of intensity UV
was being used for?
>The problem with using a blacklight in a kids room is that the kid is
>not going to take any notice of the safety issues, and will probably
>stick their nose on it sooner or later, with dark-accustomed eyes. The
>result can be swelling and inflammation of the back of the eye,
>temporary blindness, pain, and detachment of the retina from the eye.
>Its known as snow-blindness, and it is possible for it to cause
>permanent and considerable damage.
It would actually be near impossible for current child to access it - it
would be 7 ft up in an alcove that is not visable from below at all. As he
is only 2.5 yrs at the mo and there is nothing to climb on its not a major
issue at the moment. I still think that I will pass on the idea though :(
>> I noticed that one of the Safeway stores
>> in Canterbury now uses UV lighting in the loos (and this is not to
>> make things glow :-) - again, I guess it isn't somewhere you would
>> be hanging around for long.
>
>you cant see ultraviolet, its invisible. I dont know what they've got
>but it might well be violet rather than ultraviolet.
It says UV on the door but is a fairly dark violet colour. I take it that
this is perfectly safe then (assuming it is all visable violet)? If so,
are violet tubes available at reasonable price anywhere? Maplin seem to list
normal tubes and UV tubes but nowt in between. They do have coloured cold
cathode tubes for PC mods though - I may have a play... :-)
Darren
dmc
>Have you considered making stuff out of electroluminscent sheet?
Nope.
Should I? This is the stuff that lights up (well, glows) I assume - the
stuff that some nightlights are made from?
Could be an option although sounds pricey. Is this something that I could
get hold of easily? (away from web access at the mo - telnet only so can't
search easily!)
Cheers,
Darren
Andy Dingley
>Could be an option although sounds pricey. Is this something that I could
>get hold of easily?
Used to be expensive, but showed up on the surplus market. Now it's
common as muck and Maplin et al are selling it for decorating the
inside of PCs. "glow string" is popular, but a little Googlejuice
will find you sheets too.
F-15 fighters carry night formation marker panels made from a PCB
strip about a foot long, with this EL sheet on the surface. You can
fretsaw the stuff quite easily and so long as it remains connected
into one piece, it still glows. To power it, I used those little
inverters from ancient Newbrain laptops that Greenweld sold at "3 for
a quid" for years.
Dave Liquorice
> Blimey. 1.6kW visable source would be pretty blinding I would have
> thought!
1.2kW visible is almost the standard lamp in my industry. The largest
I have worked with was 10kW, two of them, now that *was* bright and
hot!
These are halogen arc lamps (HMI) used in the film/TV industry to
match daylight colour temperature and lumen levels.
> Out of interest, can I ask what this sort of intensity UV
> was being used for?
1.6kW of UV sounds lethal to anything in range to me. Sterilisation of
surfaces?
Tim Mitchell
>It says UV on the door but is a fairly dark violet colour. I take it that
>this is perfectly safe then (assuming it is all visable violet)? If so,
>are violet tubes available at reasonable price anywhere? Maplin seem to list
>normal tubes and UV tubes but nowt in between. They do have coloured cold
>cathode tubes for PC mods though - I may have a play... :-)
>
>
know, are perfectly safe, having had all the harmful wavelengths
filtered out in the lamp coating. Our local B&Q warehouse sells them,
they fit in standard fluorescent fittings. The light is a fairly deep
blue/violet colour and causes things to fluoresce.
The "UV" incandescent lamps are a bit feeble to say the least. You only
get the very small amount of UV which all incandescent lamps produce.
--
Tim Mitchell
dmc
Tim Mitchell <ti...@sabretechnology.co.uk> wrote:
>I think "blacklight" tubes are what you are after, which as far as I
>know, are perfectly safe, having had all the harmful wavelengths
>filtered out in the lamp coating.
Yep - I am pretty sure now that that is what I want. What I am still not
entirely clear on is how safe these are. Some people seem to say no - loads
of people say that they are fine. Unfortunatly, most of the places that
claim they are fine are places selling them so they have interest!
As there is so much doubt as to their safety I think I'll give up :(
> Our local B&Q warehouse sells them,
>they fit in standard fluorescent fittings. The light is a fairly deep
>blue/violet colour and causes things to fluoresce.
Thats interesting. I hadn't even considered that B&Q might have some - I
was looking to mail order. I will pop in and have a look at what the
packing says - if its got dire health warnings then I suspect its game
over :-(
>The "UV" incandescent lamps are a bit feeble to say the least. You only
>get the very small amount of UV which all incandescent lamps produce.
Ok, Another idea shot down :-)
Cheers,
Darren
N. Thornton
> Also,away from the tube idea maplin are selling a "black light UV bulb"
> that fits normal ES or BC fittings. The chap in the shop reckons that
> it is a normal 75 watt bulb with glass that just filters all but the
> violet and UV end and that the UV from it is no worse than the UV from
> any normal lightbulb. The blurb on the website states "A standard size
> light bulb with a special coating that produces a deep purple light and
> large amounts of Ultra Violet light"
sounds quite doable. Standard filament bulbs are extremely inefficient
at producing uv. I have seen violet filamet bulbs before, but they
dont produce much of anything. Theyre very dim even in violet, let
alone uv. Theyre used in el cheapo flykillers. White bulbs are just as
effective, but of course people will pay more for something that looks
more like a proper flykill unit.
> I assume that there are magic coatings that could
> convert visable to UV
no, you can only go from shorter to longer wavelength.
> in which case this is not a good idea. If however
> it really is a normal bulb with a filter then I guess its no worse than
> any other bulb would be.
true if used under the same lighting conditions, with the same amount
of shading. But if used in the dark, with eyes wide open, not so. But
ordinary filament bulbs produce so little uv I doubt theres any
concern even then.
> It would actually be near impossible for current child to access it - it
> would be 7 ft up in an alcove that is not visable from below at all. As he
> is only 2.5 yrs at the mo and there is nothing to climb on its not a major
> issue at the moment. I still think that I will pass on the idea though :(
yup, accepted. the only problem with that argument is that kids have a
tendency to do things long before their parents think its even
possible.
> >> I noticed that one of the Safeway stores
> >> in Canterbury now uses UV lighting in the loos (and this is not to
> >> make things glow :-) - again, I guess it isn't somewhere you would
> >> be hanging around for long.
> >you cant see ultraviolet, its invisible. I dont know what they've got
> >but it might well be violet rather than ultraviolet.
> It says UV on the door but is a fairly dark violet colour.
ok, probly is then.
> I take it that
> this is perfectly safe then (assuming it is all visable violet)?
if its low power, spread over a tube's area, low ferqwuency uv, and
used in a well lit room with people only spending limited time there,
then it will be perfectly safe. Course I'm assuming they havent got
1.6kW of it going :)
> If so,
> are violet tubes available at reasonable price anywhere? Maplin seem to list
> normal tubes and UV tubes but nowt in between. They do have coloured cold
> cathode tubes for PC mods though - I may have a play... :-)
Long time since I bought any out of the ordinary tubes, and I've
tended to use either halogens or mercury arcs for uv. For most tube
type apps, halogens are cheaper and easier.
Regards, NT
The Natural Philosopher
> In article <0G8koyydO9n$EA...@tega.co.uk>,
> Tim Mitchell <ti...@sabretechnology.co.uk> wrote:
>
>
>>I think "blacklight" tubes are what you are after, which as far as I
>>know, are perfectly safe, having had all the harmful wavelengths
>>filtered out in the lamp coating.
>>
>
> Yep - I am pretty sure now that that is what I want. What I am still not
> entirely clear on is how safe these are. Some people seem to say no - loads
> of people say that they are fine. Unfortunatly, most of the places that
> claim they are fine are places selling them so they have interest!
>
> As there is so much doubt as to their safety I think I'll give up :(
>
Cobblers. You get more UV off a beah in summer or a high altuitude
snowscape in winter.
As long as the little bugger doesn't spend hours with the tube mashed up
against his eyeballs...
Anyway, they told us wanking made us go blind....
Suz
> snowscape in winter.
>
> As long as the little bugger doesn't spend hours with the tube mashed up
> against his eyeballs...
Oh you sound so caring I wish you were my dad. Will you adopt me?
The Natural Philosopher
Hmm. Are you house trained?
>
>
N. Thornton
Hi. They were carbon arc parabolic reflector focussed beam lights,
1.6kW arcs. Not 1.6kW of uv, but still enough uv to blind instantly if
you caught them unfocussed, and I expect they'd blind permanently if
you got caught up with the focussed beam.
One part of the construction was open so you had to be _very_ aware of
where you walked. I think the H&S people would wet themselves
nowadays.
Regards, NT
derek
>
>From school discos many moons back I seem to remeber that dandruff can
>glow quite well as well :-)
>
Especially if you wash your hair in DAZ.
DG