On Fri, 22 Apr 2005, Olin Lathrop wrote:

> 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.

Peter
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