"Jeff Liebermann" wrote in message
...
On Sat, 10 Apr 2010 12:32:42 -0400, Meat Plow wrote:

http://en.wikipedia.org/wiki/Metal_halide_lamp

Seems there are all sorts of different Halide combinations that affect
color.

I blundered onto this page of such lights:
http://www.lamptech.co.uk/MBI%20Quartz.htm
Each includes a color spectra graphs. Most are made to belch multiple
colors trying to simulate white daylight. However, this one:
http://www.lamptech.co.uk/Spec%20Sheets/Narva%20NC400-04.htm
shows a very blue/UV spectra. The bulb is for medical purposes, not
street lighting. However, it's the closest I could find to blue:

It is based on the NC400-64 blue coloured indium lamp, but
the dose chemistry has been modified to include the halides
of gallium and lithium. Gallium in particular adds a
strong blue and several UV peaks in the spectrum.



--
Jeff Liebermann


Good links, and also Meat's Wiki one. It's a far more interesting subject
than I had given it credit for ...

Arfa