[Alt-photo] uv content of led lights

Matti Koskinen mjkoskin at gmail.com
Sat Sep 23 20:14:11 UTC 2017


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
>>>>> 
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