From: Judy Seigel (jseigel@panix.com)
Date: 06/19/01-09:08:33 PM Z
On Tue, 19 Jun 2001, Jeffrey D. Mathias wrote:
> Judy Seigel wrote:
> > ...
> > The so-called "aquarium" lights are the AQA bulbs, and are liked for pt/pd
> > because the output supposedly peaks at 414 nm, pt-pd's greatest
> > sensitivity. ...
>
> So what is the source for this piece of information. I am still waiting
> to see some work outlining the spectral sensitivity of Pt/Pd coatings.
> Please present us with a reference, otherwise I feel the 414 nm might
> just be someone's supposition. I have had a long interest in this
I spoke to the brainiac at Voltarc, company that made the F40T12/AQA
bulb...Called them after I'd found that bulb in my classroom at ICP & the
techie boys making holy fetish of it. Latest greatest mysterioso marvel.
But no facts. I forget the man's name (it was 1998), but he was quite
forthcoming about their various bulbs in production & prototype. Another
was the BL9, max output at 360 nm, but I never heard of it marketed.
They were in Waterbury CT, 203/255-2633. Don't mention my name.
Checking my reference on the AQA now (in P-F #2), however, I see it was
420 nm, not 414. Believe me, doesn't matter for our purposes. Even with
all their instrumentation, that's still a loose figure. The ingredients &
lots of other things, maybe which side of the slope the pt came from, and
DEFINITELY the particular phosphors in each batch of bulbs, have an
effect. That's another reason why this tweaking of UV bulbs is more ritual
than substance.
For instance, has anybody besides me noticed that the "same" bulb bought
at different times emits different color to the eye ? I have some pink,
blue & lavender when lit. The fellow explained, it's the phosphors. I'd
bet different nanometers too.
Judy
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