Re: New Photosensor Provides Support for Scotopic Vision Research

On Sep 5, 6:32 pm, nos...@xxxxxxxxxx (Paul Ciszek) wrote:
In article <P4ydnV8Ih6QvCUPbnZ2dnUVZ_oOnn...@xxxxxxxxxxx>,

Dave Schaack <dscha...@xxxxxxxx> wrote:

"Victor Roberts" <x...@xxxxxxxxxxxxxxxxxxxxx> wrote in message
news:72qqd3d5jtl5345oiob18akns7altl7ock@xxxxxxxxxx
As many of you know, Sam Berman has conducted research for
many years that shows that a light source with a
scotopically-enhanced spectrum will result in reduced pupil
diameter and enhanced vision compared to a light source with
a non-enhanced spectrum that produces the same light levels
when measured with a standard photopically-corrected light
meter.

Interesting stuff, Victor, thanks.

On this topic, sort of: Is there a consensus as to which wavelength
of light would provide the most energy-efficient illumination if you
had to pick just one? i.e., suppose I want to run emergency lights off
of batteries, don't care about aesthetics, and I think that LED's might
provide the best time/brightness tradeoff if I get some that only make
the "best" wavelength.

If you really don't care about aesthetics and can live with nearly
monochromatic bright yellow then low pressure sodium SOX lamps have
just about the highest ~200 lumens per watt available at 590nm. ISTR
the smallest wattage bulbs are around 18W and they require a suitable
ballast and ignition circuit.

Despite being a bit off the mark for wavelength I reckon it still wins
hands down for energy efficeincy.

Regards,
Martin Brown

.

Relevant Pages

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  • Re: The IRT transform equations
    ... From observer A's point of view the transforms are as follows: ... Lambda=wvaelength of the standard light source in A's frame as ... measures his standard light source to have the same wavelength. ...
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