From: Jeff Foster, CCS Open System Group (jfoster@uclink.berkeley.edu)
Date: 04/21/03-10:59:46 AM Z
seems that an mcd = lux or lum ( thanks Terry Holsinger) . so if a blb tube
puts out 2000 lum that would equal 1 led. although the light fall is
different.
hmm, might have to get a few and see what happens. IF I get anything useful
I will share.
Jeff
----- Original Message -----
From: "Phillip Murphy" <pmurf@bellsouth.net>
To: <alt-photo-process-l@skyway.usask.ca>
Sent: Saturday, April 19, 2003 2:11 AM
Subject: UV LED printer/ Becquerel LED developing
> Hello Jeff,
>
> I haven't tested the output of these LEDs for printing
> with UV sensitive materials.
>
> However, I constructed a small LED array using diodes with
> output in the red region of the spectrum for developing
> Becquerel developed Daguerreotypes.
>
> A large array is costly to construct. I would like to
> know of your success if you decide to construct one for UV.
> I considered this for Woodburytype exposures a while back
> but following through with that remains for another day.
>
> best regards,
> Phillip
>
>
> "Jeff Foster, CCS Open System Group" wrote:
>
> > hi all,
> > does anyone know if it would be practical to build a
> > uv lightbox using the newer UV LED as a light source?
> >
> > The UV LED I saw had a an output expressed in "mcd" that was
> > 2000 mcd.
> > http://www.superbrightleds.com/leds/uv_specs.htm
> >
> > What is the output of a blb uv tube expressed in mcd???
> >
> > any EE out there who might know the math ?
> >
> > just s thought ....
> >
> > thanks for the time,
> > Jeff
> >
> > ----
> > Jeff Foster
> > 642-8552
> > CCS - Open Systems Group
> > UC Berkeley
>
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