Re: Alt-photo-process-list Digest, Vol 250, Issue 4


Andy Schmitt
 

Nicely done... Thank you (& your son)

Regards
Andy Schmitt

-----Original Message-----
From: Alt-photo-process-list [mailto:alt-photo-process-list-bounces@...] On Behalf Of Bob Denst via Alt-photo-process-list
Sent: Saturday, October 19, 2019 2:34 PM
To: Alt Process listserve <alt-photo-process-list@...>
Subject: Re: [Alt-photo] Alt-photo-process-list Digest, Vol 250, Issue 4

John, though it may not be of use to you, I’m providing a link to the plans my son created along with a few photos of the finished product. As far as the LEDs go, I got them off of Amazon but did some research prior to purchasing and concluded that they were right in the sweet spot as far as the nm goes. I did some test exposures and found the times to be even shorter than they were for the fluorescent unit at my college that I had been using:

https://drive.google.com/open?id=1w7B76Vz3WLohKLw0VitYwj7v-vNNOxnB <https://drive.google.com/open?id=1w7B76Vz3WLohKLw0VitYwj7v-vNNOxnB>




On Oct 19, 2019, at 5:00 AM, alt-photo-process-list-request@... wrote:

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Today's Topics:

1. Re: Alt-photo-process-list Digest, Vol 250, Issue 1 (John Brewer)
2. Re: Alt-photo-process-list Digest, Vol 250, Issue 1
(Mark Severson)


----------------------------------------------------------------------

Message: 1
Date: Fri, 18 Oct 2019 21:30:38 +0100
From: John Brewer <johnbrewerphotography@...>
To: Clay Harmon <clay@...>,
alt-photo-process-list@...
Subject: Re: [Alt-photo] Alt-photo-process-list Digest, Vol 250, Issue
1
Message-ID: <60B0CFCF-ABD6-42A7-867D-D7EFA983CBAD@...>
Content-Type: text/plain; charset=utf-8

Thanks, Clay. Looking forward to seeing your ideas Bob and Alan too!

Best wishes

John

Sent from my iPhone

On 17 Oct 2019, at 4:47 pm, Clay Harmon via Alt-photo-process-list <alt-photo-process-list@...> wrote:

?I was in the process of pulling all this together for John, but here is what I have come across in my UV-LED lightbox building process:

real UV-LED strips from here:
https://store.waveformlighting.com/products/real-uv-led-strip-lights?
variant=12527605252198
<https://store.waveformlighting.com/products/real-uv-led-strip-lights
?variant=12527605252198>

These are 365nm wavelength lights. They also sell a 395nm version. The ?black-light? LED strips on Amazon are mostly novelty items and don?t really put out UV light in the wavelengths we need.

They run on 12V DC, and the forward voltage on the strips limit them to 15m lengths, so for most boxes, you will need to run two or three sets of strips in parallel, and power them with a switching power supply to keep the load balanced:

This:
https://www.amazon.com/gp/product/B07C2WBR1L/ref=ppx_yo_dt_b_asin_tit
le_o09_s00?ie=UTF8&psc=1
<https://www.amazon.com/gp/product/B07C2WBR1L/ref=ppx_yo_dt_b_asin_ti
tle_o09_s00?ie=UTF8&psc=1> if you are comfortable with wiring an AC
in and DC out for the lights

or this, if you want something easier that is less daunting to wire
together:
https://www.amazon.com/gp/product/B07MZRMF21/ref=ppx_yo_dt_b_asin_tit
le_o07_s00?ie=UTF8&psc=1
<https://www.amazon.com/gp/product/B07MZRMF21/ref=ppx_yo_dt_b_asin_ti
tle_o07_s00?ie=UTF8&psc=1>

The lights produce some heat, and it is probably a good idea to mount them on a material that conducts heat and help dissipate it, such as aluminum.

Some inexpensive computer fans that run on 12V DC can easily be added to the same light circuits to move air across the light panel and through the box:

https://www.amazon.com/gp/product/B00006HOMA/ref=ppx_yo_dt_b_asin_tit
le_o03_s00?ie=UTF8&psc=1
<https://www.amazon.com/gp/product/B00006HOMA/ref=ppx_yo_dt_b_asin_ti
tle_o03_s00?ie=UTF8&psc=1>

If you are comfortable wiring the AC side of the box, it is easy to add a timing relay to the input AC to turn the lights on and off:

https://www.amazon.com/gp/product/B075GSGH85/ref=ppx_yo_dt_b_asin_tit
le_o02_s00?ie=UTF8&psc=1
<https://www.amazon.com/gp/product/B075GSGH85/ref=ppx_yo_dt_b_asin_ti
tle_o02_s00?ie=UTF8&psc=1>


Hope this helps

Clay




On 2019-10-17, at 10:16 :21, Jean Daubas via Alt-photo-process-list <alt-photo-process-list@...> wrote:

Hi Alan,
I am also very interested by some details about your realization, specially about the kind of LED bulbs you found to produce usable UV light for our Alt processes.

"Alt-cheers" from France
jean


Le 17/10/2019 ? 14:26, Alan Glover via Alt-photo-process-list a ?crit :
Hi John

I dont have any plans as such, but I built my own unit which is fine for A3. I would be happy to take photos, measurements and lay out in detail my lighting wiring for you if that would help. Apart from the electrical stuff all the wood was just off the shelf from B&Q.
_______________________________________________
Alt-photo-process-list | altphotolist.org
_______________________________________________
Alt-photo-process-list | altphotolist.org

------------------------------

Message: 2
Date: Fri, 18 Oct 2019 16:47:31 -0400
From: Mark Severson <mphoto@...>
To: Clay Harmon <clay@...>,
alt-photo-process-list@...
Subject: Re: [Alt-photo] Alt-photo-process-list Digest, Vol 250, Issue
1
Message-ID: <C4F4362E-3703-4482-B7D6-88C1E38E10BC@...>
Content-Type: text/plain; charset=utf-8

Clay, thanks for these links. The power supply information is great - I can do the wiring, but I always have trouble figuring out what to buy! I?ve been looking at the uv-led strips you gave the link to below, the 365 nm should be perfect for Pt/Pd. One question: what spacing between the strips are you using, and what height above the photosensitive material?

Thanks,

Mark

On Oct 17, 2019, at 11:46 AM, Clay Harmon via Alt-photo-process-list <alt-photo-process-list@...> wrote:

I was in the process of pulling all this together for John, but here is what I have come across in my UV-LED lightbox building process:

real UV-LED strips from here:
https://store.waveformlighting.com/products/real-uv-led-strip-lights?
variant=12527605252198
<https://store.waveformlighting.com/products/real-uv-led-strip-lights
?variant=12527605252198>

These are 365nm wavelength lights. They also sell a 395nm version. The ?black-light? LED strips on Amazon are mostly novelty items and don?t really put out UV light in the wavelengths we need.

They run on 12V DC, and the forward voltage on the strips limit them to 15m lengths, so for most boxes, you will need to run two or three sets of strips in parallel, and power them with a switching power supply to keep the load balanced:

This:
https://www.amazon.com/gp/product/B07C2WBR1L/ref=ppx_yo_dt_b_asin_tit
le_o09_s00?ie=UTF8&psc=1
<https://www.amazon.com/gp/product/B07C2WBR1L/ref=ppx_yo_dt_b_asin_ti
tle_o09_s00?ie=UTF8&psc=1> if you are comfortable with wiring an AC
in and DC out for the lights

or this, if you want something easier that is less daunting to wire
together:
https://www.amazon.com/gp/product/B07MZRMF21/ref=ppx_yo_dt_b_asin_tit
le_o07_s00?ie=UTF8&psc=1
<https://www.amazon.com/gp/product/B07MZRMF21/ref=ppx_yo_dt_b_asin_ti
tle_o07_s00?ie=UTF8&psc=1>

The lights produce some heat, and it is probably a good idea to mount them on a material that conducts heat and help dissipate it, such as aluminum.

Some inexpensive computer fans that run on 12V DC can easily be added to the same light circuits to move air across the light panel and through the box:

https://www.amazon.com/gp/product/B00006HOMA/ref=ppx_yo_dt_b_asin_tit
le_o03_s00?ie=UTF8&psc=1
<https://www.amazon.com/gp/product/B00006HOMA/ref=ppx_yo_dt_b_asin_ti
tle_o03_s00?ie=UTF8&psc=1>

If you are comfortable wiring the AC side of the box, it is easy to add a timing relay to the input AC to turn the lights on and off:

https://www.amazon.com/gp/product/B075GSGH85/ref=ppx_yo_dt_b_asin_tit
le_o02_s00?ie=UTF8&psc=1
<https://www.amazon.com/gp/product/B075GSGH85/ref=ppx_yo_dt_b_asin_ti
tle_o02_s00?ie=UTF8&psc=1>


Hope this helps

Clay




On 2019-10-17, at 10:16 :21, Jean Daubas via Alt-photo-process-list <alt-photo-process-list@...> wrote:

Hi Alan,
I am also very interested by some details about your realization, specially about the kind of LED bulbs you found to produce usable UV light for our Alt processes.

"Alt-cheers" from France
jean


Le 17/10/2019 ? 14:26, Alan Glover via Alt-photo-process-list a ?crit :
Hi John

I dont have any plans as such, but I built my own unit which is fine for A3. I would be happy to take photos, measurements and lay out in detail my lighting wiring for you if that would help. Apart from the electrical stuff all the wood was just off the shelf from B&Q.
_______________________________________________
Alt-photo-process-list | altphotolist.org
_______________________________________________
Alt-photo-process-list | altphotolist.org


------------------------------

Subject: Digest Footer

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------------------------------

End of Alt-photo-process-list Digest, Vol 250, Issue 4
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