RE: AmerGraph ULF-28

Marek,

It is a kind of HID lamp, like the metal halide,
but there are some significant advantages. Unlike
metal halide lamps, which may take several
minutes to reach full radiation, CWX gives full
output almost immediately. And, the lamp will
strike immediately after shut-down, unlike MH
lamps, which usually must cool down before they
will re-strike.

The SPD curve of varies according to Dose, as you
have the choice of Gallium, Mercury, Iron,
Thallium, Lead, or Indium, all with radiation
spikes at different points on the SPD chart. I
have been working with the Mercury Dos, which is
fairly similar to the SPD of BL tubes, with a
major spike at 365 nm, but also has a spike
almost as high at 435 nm which is responsible I
believe for the very high printing speed of the
ULF-28.

People who know palladium printing should be able
to look at the data I provided and get a
reasonably good idea of the printing speed of
this unit compared to their own. The ULF-28 is
without question the fastest printing light I
have ever used, and I have tested a number of
different light sources, including a number of
HID lamps, the NuArc 261k and 261ks, as well as
fluorescent banks using AQUA, BL, BLB, and SA
tubes.

Sandy

>Sandy,
>What is a continuous wave xenon? And congrats on
>your new full time job (photography?)
>
>Marek, Houston
>
>>From: Sandy King <sanking@clemson.edu>
>>Reply-To: alt-photo-process-l@usask.ca
>>To: alt-photo-process-l@usask.ca
>>Subject: AmerGraph ULF-28
>>Date: Thu, 01 Jun 2006 15:27:52 -0400
>>
>>
>>This is a brief update on my experience with
>>the Amer-Graph ULF-28 printing unit. For those
>>who may not have seen my first message about
>>this unit, it is a Continuos Wave Xenon plate
>>maker, similar in size and configuration to the
>>NuArc 261k and 261ks. This is a prototype unit
>>which was sent to me by Amer-Graph for testing
>>purposes.
>>
>>Over the past several weeks I have tested the
>>ULF-28 with several printing processes,
>>including palladium, cyanotype, palladium and
>>carbon, comparing the results with my bank of
>>BL fluorescent tubes. Papers used were
>>Stonhenge and COT 320. With every process, when
>>using the same paper, the ULF-28 prints a full
>>1.5 stops faster than the BL bank.
>>
>>For example, take the following situation.
>>
>>1. Pure palladium on COT 320.
>>2. Double Coating, using 2 ml of a 1:1 mixture
>>of 15% palladium chloride and 25% ferric
>>oxalate for both coatings. Short blast with
>>hair dryer after both coatings to keep the
>>solution on the surface.
>>3. Dry for 15 minutes, with air from fan.
>>4. Exposure with a Stouffer TP 4X5 step wedge
>>5. Development in a 25% solution of potassium
>>oxalate, with 2ml of a 5% solution of potassium
>>dichromate added per liter of developer for
>>contrast control.
>>6. Workroom at 72ºF, RH 52%.
>>
>>Best exposure for the ULF-28, as judged by the
>>first maximum density that merges with the next
>>one, was 50 units, where one unit = 1.3
>>seconds, for a total time of 65 seconds.
>>
>>Best exposure for the BL bank, similar
>>evaluation, was 200 units, where one unit =
>>.98 seconds, for total time of 196 seconds.
>>
>>The ES of palladium, as processed above, was 12
>>steps (of log .15 each) from maximum density to
>>paper white, or about 1.80.
>>
>>I will be doing a full review of this unit for
>>publication later this summer. Hoped to have it
>>done by now but have been delayed due to
>>complications from eye surgery.
>>
>>Sandy
Received on 06/02/06-08:01:29 AM Z