Eric Neilsen (e.neilsen@worldnet.att.net)
Wed, 14 Jul 1999 16:45:43 -0500
Bill et la,
I have been off list since beginning of June and I digging through the list. I
have not run exhaustive test on the BLB, BL and SA, but I hope to run some while
I'm home. The BLB bulbs/tubes do require more time and I have seen the extra
time required change from 20% more to 100% more. They do also cost more but
perhaps 1.5 times as much. Remember prices change and anything is possible,
even B&S lowered their palladium prices. BLs work fine for platinum and gum. I
have run some prints (50, some 20x24) with SAs and they do print with more
contrast. I have yet to make test from the all the lamps with the same
chemistry and other elements (RH, PAPER, etc.) factored in. When I have time
I'd be happy to share those results.
As for John Rudiaks' comments with Davids' light system, he failed to include
that DMK uses (or did, he was including that info years ago in light information
post) the ice cap ballast. There was some discussion of these a little while
back. they do increase light output, but shorten bulb life.
I also have many spectral outputs of NuArc lamps. With so many choices out
there, I recommend to go with what fits your pocket book. The BL lamps have
proven to be successful for many processes, and while they may not be the
fastest, they work just fine. If you can afford it, what the hell, buy a set of
each and a plate burner to boot!
just some musings from Dallas
EJ Neilsen
William Laven wrote:
> I believe Bill has
> >mentioned many times that super actinic works better for Pt (if I remember
> >correctly). That information should be in the archive already.
> >
>
> I have said that often. In my tests, Super Actinics, which emit a narrow
> band peaking at 420nm, print faster then traditional "black light" bulbs,
> which emit a broad band that peaks at 350 or 360nm. A friend of mine did
> comparisons of BL vs. Super Actinics with POP and found the SA's produced
> shorter exposure times and at least a grade's worth more contrast.
>
> Eric Neilsen did some comparisons of BL vs. SA for Pt/Pd, too. Eric, are
> you reading this? Do you have a report?
>
> Bill
>
-- Eric J. Neilsen 4101 Commerce Street, Suite #9 Dallas, TX 75226 214-827-8301 http://home.att.net/~e.neilsen
This archive was generated by hypermail 2.0b3 on Thu Oct 28 1999 - 21:40:36