[Alt-photo] uv content of led lights

Marek Matusz marekmatusz at hotmail.com
Sat Sep 23 20:00:57 UTC 2017


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
>>> 
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