Re: AmerGraph ULF-28

John,

Xenon lamps are available as either
continuous-wave constant light (CW) or as pulsed
wave (strobe ) systems. CW xenon lamps are best
where continuous light and a good color balance
are required. Xenon strobes, or pulsed wave,
produce short duration pulses of high intensity
light.

Pulsed wave xenon has been used for quite a while
in graphic arts applications, but I personally
have no experience with these type of units in
terms of their spectral response and ability to
expose UV sensitive processes. CW Xenon has also
been around for a long time in other industries,
but the ULF-28 appears to be the first, or one of
the first, plate makers to use this light source.

Since I have never used pulsed xenon technology I
can not compare it to CW Xenon. However, I can
compare CW Xenon to HID metal halide and mercury
vapor lamps since since I have experimented with
several such units. And, as I indicated earlier,
the major advantages of the ULF-28 over the metal
halide and mercury vapor units I have tested are,
1) full output almost immediately on striking the
lamp, and 2) ability to re-strike immediately
after shut down.

Sandy

>I actually know very little about Xenon... Just what is the difference
>between the pulsed Xenon and the Continuous wave..? I have several
>pulsed Xenon light sources and I was hoping to set up one PX unit head on
>a 8x10 enlarger for direct enlargement to Carbon Paper............jc
>
>
>
>
>
>
>-- Original Message -----
>From: "Sandy King" <sanking@clemson.edu>
>To: <alt-photo-process-l@usask.ca>
>Sent: Friday, June 02, 2006 3:06 PM
>Subject: Re: AmerGraph ULF-28
>
>
>John,
>
>I am not sure why your comment about the filters?
>The continuos wave xenon ULF-28 is being marketed
>to photographers, and the filters I mention have
>as their purpose reducing the light of a 1200
>watt bulb to allow printing with silver papers,
>or to providing contrast control through VC type
>filters.
>
>In any event, pulsed xenon and continuos wave
>xenon are different technologies. My
>understanding in speaking to the folks at
>Amer-Graph is that the ULF-28 is the first plate
>maker to use a continuos wave xenon.
>
>Sandy
>
>
>
>
>>Traditionally Pulsed Xenon has been used to expose graphic art films
>>including ortho... I could easily be wrong but I was not aware that they
>>needed a special filter to expose these materials..........
>>
>>John Cremati .
>>
>>
>>----- Original Message -----
>>From: "Sandy King" <sanking@clemson.edu>
>>To: <alt-photo-process-l@usask.ca>
>>Sent: Friday, June 02, 2006 10:23 AM
>>Subject: RE: AmerGraph ULF-28
>>
>>
>>Don,
>>
>>I have been told that the base cost will be
>>approximately $1900 if purchased directly from
>>Amer-Graph.
>>
>>There is also the possibility that the unit will
>>have accessories that allow printing of silver
>>papers. There is a filter slot about 19.5" X
>>21/5" between the lamp and the glass that will
>>allow the use of light attenuators and filters.
>>In theory this should allow the use of ND,
>>anti-actinic, and VC filters so that this unit
>>could be a multi-purpose light for printing with
>>both alternative processes and silver as well. I
>>think the silver option may be attractive since
>>there are many people who want to scan their
>>negatives and make digital negatives for contact
>>printing.
>>
>>Sandy
>>
>>
>>
>>>So Sandy, what is the expected expense of such a unit?
>>>
>>>Don Bryant
>>>
>>>
>>>-----Original Message-----
>>>From: Sandy King [mailto:sanking@clemson.edu]
>>>Sent: Friday, June 02, 2006 10:01 AM
>>>To: alt-photo-process-l@usask.ca
>>>Subject: 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 06/02/06-09:18:12 PM Z