From: Jeff Foster, CCS Open System Group (jfoster@uclink.berkeley.edu)
Date: 04/21/03-12:48:28 PM Z
correction:
each LED produces 2000 milli candela (2.000 cd) so it would require 1000
> (2000*.0002) LED's to "equal" the output of one tube
sorry to mis inform....
Jeff
----- Original Message -----
From: "Jeff Foster, CCS Open System Group" <jfoster@uclink.berkeley.edu>
To: <alt-photo-process-l@skyway.usask.ca>
Sent: Monday, April 21, 2003 9:59 AM
Subject: Re: UV LED printer/ Becquerel LED developing
> 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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