RE: Light source for big prints

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From: Keith Gerling (keithgerling@att.net)
Date: 03/19/02-06:18:32 PM Z


Sandy,

Great article. I had made a mental note to read this when it was published,
and then plum forgot about it. It tends to support my decision to remain
with Sylvania BL. I doubt if the extra speed of the HID would still be
present after the bulb is extended far enough back to cover a 30 x 40. And
the exposure range for the HID was rather disappointing as well.

Beautiful accompanying photographs, too. I'm assuming that most of these
are Carbons. I love the colors, especially the soft green of the bamboo.

Thanks.

Keith

-----Original Message-----
From: Sandy King [mailto:sanking@clemson.edu]
Sent: Tuesday, March 19, 2002 1:08 PM
To: alt-photo-process-l@sask.usask.ca
Subject: RE: Light source for big prints

Keith,

If you have not already done so have a look at my article on UV light
sources at http://unblinkingeye.com/Articles/Light/light.html

Sandy King

>John,
>
>My intent was to minimize (hide!) the appearance of a line going down the
>middle of the print. The fixtures would be butted together, but that would
>still leave a 2 inch gap of no light emission - the bulb holder, and the
>ends of the bulbs temselves (bulb is 22" - fixture is 24")
>
>I wasn't aware of the 48" fixtures. Thanks. I'll look into that.
>
>Keith
>
>
>
>-----Original Message-----
>From: John Campbell [mailto:tojohn@texas.net]
>Sent: Tuesday, March 19, 2002 9:40 AM
>To: alt-photo-process-l@sask.usask.ca
>Subject: RE: Light source for big prints
>
>
>Keith,
>
>If you are building a new array from scratch, why not use 48" fixtures and
>40-watt tubes? I recommend Phillips product number 046677-30108-5, which
is
>a super actinic radiation source available in 48-inch lengths. I don't
>think you'll have any problem with lengthy exposure times!
>
>FWIW, I don't really see a problem with your staggered graphic-but I wonder
>why you would need 2 1/2 inches between the fixture ends. Maybe I'm not
>getting your intent.
>
>Good luck,
>-John
>
>http://www.photogecko.com/
>Home of The Gecko UV Light Box
>"Get The Gecko!"
>
>-----Original Message-----
>From: Keith Gerling [mailto:keithgerling@att.net]
>Sent: Tuesday, March 19, 2002 12:08 PM
>To: alt-photo-process-l@skyway.usask.ca
>Subject: Light source for big prints
>
>Currently, I use a bank of Sylvania 20w Black light bulbs, which
>provide coverage for 22x30 in prints. As I now have a need to print 30x40,
>I am considering alternatives. One option would be to go to another light
>source (yard lights, etc.) but I am concerned about lengthy exposure times.
>As I am comfortable with using the flourescent source, I am wondering if
>there might be a way to build a larger light bank using 22 inch bulbs. My
>question: if I were to line up two banks side-by-side, and stagger them by
4
>inches like this:
>
> ============ ============
> ============ ============
> ============ ============
> ============ ============
>
> etc,
>
>what are the chances that the gap between banks (approx 2 1/2 inches) would
>be "filled in" and not effect the print. Currently, the print is about 4
>inches from the light source.
>
>I'd appreciate any other ideas.
>
>Keith

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