On Mon, 2005-04-25 at 00:46 +1000, Tony Smith wrote:
> > Sorry Tony, the thread I was following was;
> >
> > [EE] Safe viewing of colours?
> >
> > Your reference to blue lighting in public toilets
> > was relevant to the OPs question but the
> > expansion into how intravenous drug users
> > could get around the measure just made
> > me cringe.
> 
> 
> There was a post about blue lighting used in trains & hospitals at night,
> presumably the colour is chosen because it doesn't upset peoples sleep.
> I've never actually seen that, but as mentioned, there's another reason for
> blue lights (which doesn't work).

The one thing I really dislike about deep blues is that focusing becomes
rather difficult. It seems the eye just isn't properly tuned to focus
when only short wavelengths are present. In bright light it's not a
problem due to the increased depth of field, but in low light levels
blue is really annoying.

Discovered this effect for the first time when someone used a dark blue
light as minimal lighting behind the rear curtain of a stage (a passage
the actors used to get from the green room to the other side of the
stage). Changing the light to a dark green helped immensely. TTYL

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