From: Terry Holsinger (trhli@sprynet.com)
Date: 04/21/03-12:46:08 PM Z
Hey we all get excited by new tech useable for old tech. Give it a try
and let us know how things work.
Terry H.
"Jeff Foster, CCS Open System Group" wrote:
>
> 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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