[Alt-photo] Antwort: Re: uv content of led lights

udo.schnitzbauer at uzh.ch udo.schnitzbauer at uzh.ch
Mon Sep 25 07:41:01 UTC 2017


Here a PDF:

http://www.ssi.shimadzu.com/products/literature/uv/VIS/A444.pdf

Seems there is no UV radiation detectable....

Udo

-----"Alt-photo-process-list" <alt-photo-process-list-bounces at lists.altphotolist.org> schrieb: -----
An: alt-photo-process-list at lists.altphotolist.org
Von: calvin grier via Alt-photo-process-list 
Gesendet von: "Alt-photo-process-list" 
Datum: 23.09.2017 22:33
Betreff: Re: [Alt-photo] uv content of led lights

Hello,

I did a test of safelights a while back. Testing was for carbon, but the
findings should be applicable to cyano. I found incandescent lights to be
one of the worst choices. Here´s the link-
http://thewetprint.com/en/2016/09/29/safelights/

All the best,
Calvin

On Sat, Sep 23, 2017 at 10:14 PM, <
alt-photo-process-list-request at lists.altphotolist.org> wrote:

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>    1.  uv content of led lights (Matti Koskinen)
>    2. Re:  uv content of led lights (Marek Piosik)
>    3. Re:  uv content of led lights (Matti Koskinen)
>    4. Re:  uv content of led lights (Marek Matusz)
>    5. Re:  uv content of led lights (Matti Koskinen)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 23 Sep 2017 21:39:56 +0300
> From: Matti Koskinen <mjkoskin at gmail.com>
> To: The alternative photographic processes mailing list
>         <alt-photo-process-list at lists.altphotolist.org>
> Cc: Matti Koskinen <mjkoskin at kolumbus.fi>
> Subject: [Alt-photo] uv content of led lights
> Message-ID: <7A3A3D23-0565-492A-8627-7976044F38EB at gmail.com>
> Content-Type: text/plain; charset=us-ascii
>
> hi,
>
> Is there any risk of fogging, when using led lights and coating papers for
> cyanos? Of course not under direct light, but in somewhat shadowy spot.
>
> tnx
>
> -m
>
>
>
> ------------------------------
>
> Message: 2
> Date: Sat, 23 Sep 2017 21:15:07 +0200
> From: Marek Piosik <marek.piosik at parsival.pl>
> To: alt-photo-process-list at lists.altphotolist.org
> Subject: Re: [Alt-photo] uv content of led lights
> Message-ID: <59C6B2BB.8030009 at parsival.pl>
> Content-Type: text/plain; charset=windows-1252; format=flowed
>
> Hi, what color of LED light do you want to use? Because I used remote
> controlled LED bulb set to dimmer red and it probably fogged my carbon
> tissue. So take care and maybe use good old incandescent light...
>
> Regards,
> Marek
>
> On 2017-09-23 20:39, Matti Koskinen via Alt-photo-process-list wrote:
> > hi,
> >
> > Is there any risk of fogging, when using led lights and coating papers
> for cyanos? Of course not under direct light, but in somewhat shadowy spot.
> >
> > tnx
> >
> > -m
> >
> > _______________________________________________
> > Alt-photo-process-list | altphotolist.org
> >
> > ---
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> > http://www.avg.com
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>
>
> ------------------------------
>
> Message: 3
> Date: Sat, 23 Sep 2017 22:43:07 +0300
> From: Matti Koskinen <mjkoskin at gmail.com>
> To: alt-photo-process-list at lists.altphotolist.org
> Subject: Re: [Alt-photo] uv content of led lights
> Message-ID: <3ea40e88-13fd-a307-b0cf-e642a1f03915 at gmail.com>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> Normal warm white leds, incandescent bulbs are just getting so rare
> nowadays. I may find one right now to try to make some cyanos.? CFLs are
> absolutely out of question. My darkroom light is a bunch of red leds, I
> haven't noticed any fogging using them when developing paper negatives,
> but the red colour makes it very difficult to see if coating of cyano is
> even.
>
> tnx
>
> -m
>
>
>
> On 23.09.2017 22:15, Marek Piosik via Alt-photo-process-list wrote:
> > Hi, what color of LED light do you want to use? Because I used remote
> > controlled LED bulb set to dimmer red and it probably fogged my carbon
> > tissue. So take care and maybe use good old incandescent light...
> >
> > Regards,
> > Marek
> >
> > On 2017-09-23 20:39, Matti Koskinen via Alt-photo-process-list wrote:
> >> hi,
> >>
> >> Is there any risk of fogging, when using led lights and coating
> >> papers for cyanos? Of course not under direct light, but in somewhat
> >> shadowy spot.
> >>
> >> tnx
> >>
> >> -m
> >>
> >> _______________________________________________
> >> Alt-photo-process-list | altphotolist.org
> >>
> >> ---
> >> This email has been checked for viruses by AVG.
> >> http://www.avg.com
> >>
> >
> > _______________________________________________
> > Alt-photo-process-list | altphotolist.org
>
>
>
> ------------------------------
>
> Message: 4
> Date: Sat, 23 Sep 2017 20:00:57 +0000
> From: Marek Matusz <marekmatusz at hotmail.com>
> To: Matti Koskinen <mjkoskin at gmail.com>,
>         "alt-photo-process-list at lists.altphotolist.org"
>         <alt-photo-process-list at lists.altphotolist.org>
> Subject: Re: [Alt-photo] uv content of led lights
> Message-ID:
>         <SN1PR16MB05593F78BD091948786B08E5BB640 at SN1PR16MB0559.
> namprd16.prod.outlook.com>
>
> Content-Type: text/plain; charset="us-ascii"
>
> Matti
> I coat under 3 leds about a meter from paper. I like bright light to see
> coating. No issues with cyanotypes.
> Marek
>
> Sent from my iPhone
>
> > On Sep 23, 2017, at 9:43 PM, Matti Koskinen via Alt-photo-process-list <
> alt-photo-process-list at lists.altphotolist.org> wrote:
> >
> > Normal warm white leds, incandescent bulbs are just getting so rare
> nowadays. I may find one right now to try to make some cyanos.  CFLs are
> absolutely out of question. My darkroom light is a bunch of red leds, I
> haven't noticed any fogging using them when developing paper negatives, but
> the red colour makes it very difficult to see if coating of cyano is even.
> >
> > tnx
> >
> > -m
> >
> >
> >
> >> On 23.09.2017 22:15, Marek Piosik via Alt-photo-process-list wrote:
> >> Hi, what color of LED light do you want to use? Because I used remote
> controlled LED bulb set to dimmer red and it probably fogged my carbon
> tissue. So take care and maybe use good old incandescent light...
> >>
> >> Regards,
> >> Marek
> >>
> >>> On 2017-09-23 20:39, Matti Koskinen via Alt-photo-process-list wrote:
> >>> hi,
> >>>
> >>> Is there any risk of fogging, when using led lights and coating papers
> for cyanos? Of course not under direct light, but in somewhat shadowy spot.
> >>>
> >>> tnx
> >>>
> >>> -m
> >>>
> >>> _______________________________________________
> >>> Alt-photo-process-list | altphotolist.org
> >>>
> >>> ---
> >>> This email has been checked for viruses by AVG.
> >>> http://www.avg.com
> >>>
> >>
> >> _______________________________________________
> >> Alt-photo-process-list | altphotolist.org
> >
> > _______________________________________________
> > Alt-photo-process-list | altphotolist.org
>
>
> ------------------------------
>
> Message: 5
> Date: Sat, 23 Sep 2017 23:14:11 +0300
> From: Matti Koskinen <mjkoskin at gmail.com>
> To: Felix Martin <martin.felix at gmail.com>
> Cc: The alternative photographic processes mailing list
>         <alt-photo-process-list at lists.altphotolist.org>
> Subject: Re: [Alt-photo] uv content of led lights
> Message-ID: <FE75BC9A-CCCA-4679-BF93-4376E4CA7CC4 at gmail.com>
> Content-Type: text/plain;       charset=utf-8
>
> many thanks to you all, and Felix, thanks for the spectrum graph. So, it?s
> time to start making cyanos right now.
>
> -m
>
> > On 23 Sep 2017, at 23:08, Felix Martin <martin.felix at gmail.com> wrote:
> >
> > I guess depends a lot on the manufacturer.
> > I do my platinum coatings under white LED?s lights with no issues.
> > But in general LED have little if not any UV emissions:
> >
> > <Screen Shot 2017-09-23 at 1.05.55 PM.png>
> >
> >> On Sep 23, 2017, at 1:00 PM, Marek Matusz via Alt-photo-process-list <
> alt-photo-process-list at lists.altphotolist.org <mailto:alt-photo-process-
> list at lists.altphotolist.org>> wrote:
> >>
> >> Matti
> >> I coat under 3 leds about a meter from paper. I like bright light to
> see coating. No issues with cyanotypes.
> >> Marek
> >>
> >> Sent from my iPhone
> >>
> >>> On Sep 23, 2017, at 9:43 PM, Matti Koskinen via Alt-photo-process-list
> <alt-photo-process-list at lists.altphotolist.org <mailto:alt-photo-process-
> list at lists.altphotolist.org>> wrote:
> >>>
> >>> Normal warm white leds, incandescent bulbs are just getting so rare
> nowadays. I may find one right now to try to make some cyanos.  CFLs are
> absolutely out of question. My darkroom light is a bunch of red leds, I
> haven't noticed any fogging using them when developing paper negatives, but
> the red colour makes it very difficult to see if coating of cyano is even.
> >>>
> >>> tnx
> >>>
> >>> -m
> >>>
> >>>
> >>>
> >>>> On 23.09.2017 22:15, Marek Piosik via Alt-photo-process-list wrote:
> >>>> Hi, what color of LED light do you want to use? Because I used remote
> controlled LED bulb set to dimmer red and it probably fogged my carbon
> tissue. So take care and maybe use good old incandescent light...
> >>>>
> >>>> Regards,
> >>>> Marek
> >>>>
> >>>>> On 2017-09-23 20:39, Matti Koskinen via Alt-photo-process-list wrote:
> >>>>> hi,
> >>>>>
> >>>>> Is there any risk of fogging, when using led lights and coating
> papers for cyanos? Of course not under direct light, but in somewhat
> shadowy spot.
> >>>>>
> >>>>> tnx
> >>>>>
> >>>>> -m
> >>>>>
> >>>>> _______________________________________________
> >>>>> Alt-photo-process-list | altphotolist.org <http://altphotolist.org/>
> >>>>>
> >>>>> ---
> >>>>> This email has been checked for viruses by AVG.
> >>>>> http://www.avg.com <http://www.avg.com/>
> >>>>>
> >>>>
> >>>> _______________________________________________
> >>>> Alt-photo-process-list | altphotolist.org <http://altphotolist.org/>
> >>>
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