http://www.intellexual.net/hid.html

This site appears to provide some credible info on HID lamps along with some
interesting 'prism tricks' employed by BMW and Audi that make their
headlights appear blue from the side even though they are actually white
(4100K). It seems clear from this site that the true high temperature 'blue
light' systems only have 'bling bling' value as they provide less light and
that the human eye is less able to see that light.

To the original poster with the night vision problem I would suggest that he
work on the other end of the problem and get some night vison glasses. I
have an emergent night vision problem and find these lenses help
significantly, especially in the rain. They also have the added benefit of
acting as BLUE BLOCKERS knocking down the intensity of the oncoming beams
from the affluent but ignorant purchasers of the blue light systems who for
some reason usually drive around with their high beams up.


"Richard Sexton" > wrote in message
...
> In article >,
> Dave Plowman (News) > wrote:
>>In article >,
>> Richard Sexton > wrote:
>>> >> Daylight is blue.
>>> >
>>> >No it's not. By definition.
>>
>>> Daylight is only not-blue at the equator.
>>
>>The colour temperature of daylight varies by the time of day and weather
>>conditions as well as latitude.
>
> Yeah, but all things being equal, on a clear day at noon light is
> bluer towards the poles. 5000K is given at the equator by
> several sources (GE, Horst & Kipper) and 6500-7500K is given
> in "norther climes" whcih ranges from Boston to Denmark.
>
> --
> Need Mercedes parts? http://parts.mbz.org
> Richard Sexton | Mercedes stuff: http://mbz.org
> 1970 280SE, 72 280SE | Home pages: http://rs79.vrx.net
> 633CSi 250SE/C 300SD | http://aquaria.net http://killi.net