> > Peter wrote:
> >> low intensity dark blue
> >
> > Phew!  I wouldn't have to come up with high intensity dark blue.
>
> ? Anyway 'night illumination' in places like hospitals and railroad
> sleeping cars is dark blue. Apparently it does not disturb sleep or
> something like that. It works for me at least. I think that it has to do
> with the red tint imparted to light by closed eyelids. The blue does not
> go through those 'filters' so the room appears to be darker than it
> really is when lit blue and seen through closed eyelids. But I may be
> wrong.

The movie industy has been putting blue filters on cameras to simulate night
for some time.  Funny how there always seems to be a full moon in all those
old movies...

Another reason for blue lights found in other areas (toilets, garages etc)
is that it makes it hard to find veins in your arms.  This makes injecting
heroin (or your preferred illegal narcotic) a bit difficult.  However, you
can use a marker (the one you use for breaking the copy protection on your
CDs) to mark out the veins beforehand.  High tech solution, meet age-old
cunning.

Tony

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