what it is, I like to wear print/horizontal/verticle lines (whatever
they are called?) shirts.What it used to be like back in the 1950s,
riding in a car underneath the Train overpass with those old timey
flourascent lights thingys, it was like my shirts would change color on
me.y'all old timers ever had similar experiences before? (I know some of
y'all have)
cuhulin

In article ,
wrote:

what it is, I like to wear print/horizontal/verticle lines (whatever
they are called?) shirts.What it used to be like back in the 1950s,
riding in a car underneath the Train overpass with those old timey
flourascent lights thingys, it was like my shirts would change color on
me.y'all old timers ever had similar experiences before? (I know some of
y'all have)

Cuhulin-

You may be referring to fluorescent lamps that emit a lot of ultraviolet
energy. Some materials light up when lit by ultraviolet light, which is
how the lamps work to begin with.

At one time, there were ultraviolet fluorescent tubes available called
"black lights", that had almost no visible light. As far as I know,
these lamps were made in common sizes that worked in existing fixtures.

These lamps may have been intended for industrial and medical
applications, but were adopted for use in night clubs and parties
because of the neat effect they produced.

If you intend to experiment with black lights, be careful. Even though
you can't see ultraviolet light, it can damage your vision.

Fred

In article ,
Fred McKenzie wrote:
what it is, I like to wear print/horizontal/verticle lines (whatever
they are called?) shirts.What it used to be like back in the 1950s,
riding in a car underneath the Train overpass with those old timey
flourascent lights thingys, it was like my shirts would change color
on me.y'all old timers ever had similar experiences before? (I know
some of y'all have)

Cuhulin-

You may be referring to fluorescent lamps that emit a lot of ultraviolet
energy. Some materials light up when lit by ultraviolet light, which is
how the lamps work to begin with.

IMHO more likely not fluorescents that caused things to change colour in
the street, but discharge lamps of some sort - low pressure sodium, etc.
These produce a very narrow spike of light frequency wise which confuses
the 'eyes'. The snag with this is the perceived colour (of the item being
lit) changes by the individual, so what may appear to be an 'nice' change
to some may not to others.

Modern high pressure sodium lighting produces a broader spectrum of light
so doesn't exhibit this tendency so much.

--
*He who dies with the most toys is, nonetheless, dead.

Dave Plowman London SW
To e-mail, change noise into sound.

fluorescent
vertical

Fluorescent and mercury-vapor lamps do not have a continuous spectrum, and
their color temperature does not match that of either daylight or household
tungsten lamps. So colors will change under them.

In article ,
William Sommerwerck wrote:
fluorescent
vertical

Fluorescent and mercury-vapor lamps do not have a continuous spectrum,
and their color temperature does not match that of either daylight or
household tungsten lamps. So colors will change under them.

That's a very broad statement without qualification. Fluorescents are
available with a pretty good spectrum - after all no artificial light
source is perfect. They're widely used in filming these days.
They're also available for the common domestic fittings that use standard
tube sizes - but you might need to go to a specialist. They're known as
tri-phosphor types and come in a variety of colour temperatures.

--
*It was all so different before everything changed.

Dave Plowman London SW
To e-mail, change noise into sound.

Fluorescent and mercury-vapor lamps do not have a continuous
spectrum, and their color temperature does not match that of
either daylight or household tungsten lamps. So colors will
change under them.

That's a very broad statement without qualification.

Yes, it is. I didn't have time to go into excruciating detail about modern
photographic fluorescents, color-rendering index, etc.

Cut me a break. Please.

"William Sommerwerck" wrote in message
...
Fluorescent and mercury-vapor lamps do not have a continuous
spectrum, and their color temperature does not match that of
either daylight or household tungsten lamps. So colors will
change under them.

That's a very broad statement without qualification.

Yes, it is. I didn't have time to go into excruciating detail about modern
photographic fluorescents, color-rendering index, etc.

Cut me a break. Please.



I almost got involved there, but bit my tongue instead .... :-)

Arfa

I have a small hand held black light around here somewhere, I bought it
at the Goodwill store about fifteen years ago, it works too.It would
take me forever to find it though.

About twenty years ago, I was watching a tv program about germs on
kitchen countertops and things.They cleaned off a kitchen countertop
real good with household detergent.Then they turned off the lights and
turned that black light on and they moved that black light around real
close over the countertop.It was amazing to see there were still a lot
of germs on top of that kitchen countertop.

I think stores which sell scientific thingys also sell black lights.
cuhulin

In article ,
wrote:
About twenty years ago, I was watching a tv program about germs on
kitchen countertops and things.They cleaned off a kitchen countertop
real good with household detergent.Then they turned off the lights and
turned that black light on and they moved that black light around real
close over the countertop.It was amazing to see there were still a lot
of germs on top of that kitchen countertop.

The power of advertising. ;-)

--
*Never miss a good chance to shut up.*

Dave Plowman London SW
To e-mail, change noise into sound.