Re: Low pressure sodium lamp

Don Klipstein wrote:
[snip]

I believe this is the "white flame" carbon arc. I found a reference
saying it's 6200 K, amd usually filtered with a pale yellowish or
orangish filter to remove much of the UV and to decrease the cct to
5700 K.

I had trouble getting Google to show me what's in them. However,
some other (maybe similar) arc, known as the "luminous arc", and one
electrode is an iron tube packed with magnetite (an iron oxide) and
titanium oxide. I found a Google-provided link saying titanium was
used in "flame arcs".

There is also the yellow flame carbon arc. I found a spectral power
distribution making me think sodium and calcium and a bit of thallium.
I remember (I hope correctly) seeing some of my Google attempt here
saying sodium and calcium were used in the yellow flame arc. The
yellow flame arc was said to have a cct of 4100 K.

I also saw a spectral power distribution for a mildly filtered white
flame arc. It was close enough to continuous for me to be unable to
figure out what was in it.

Don,

if you find any online link refs for any of those (including warmer flames),
please post them.

Many thanks,

- Don Klipstein (don@xxxxxxxxx)
--
I.N. Galidakis

.

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