Light source for big prints

At the 20th of March 2002 I sent an e-mail to alt photo about this
subject.Now this e-mail needs small corrections.
Philips sells a lot of TL-tubes but only a few of them are useful as a
UV source.
You can buy these UV tubes in various lengths from 136 till 1764 mm,with
diameters from 16 till 40,5 mm and power from 4 till 90 W.
I will only give you data from tubes with a length of 590 mm.When you
want another length ask your supplier.
I only give data from tubes with most of its emitted radiation in the UV
region (shorter than 380 nm).(will explain later why)
All these data are official Philips data.
Different length from the same type has the same emitted radiation
curve.(=spectral power distribution chart).
1) The best (in my opinion) and cheapest (!) tubes are
    UV-A CLEO performance for bodycare.
    radiationpeak(nm) 350 nm ;range(nm) 313 - 400 nm
    emitted radiation in UV range ~90 %
    40 W ; diameter 40,5 mm ; price 14 units
2) Next
    UV-A Blacklight Blue/08 ; nearly no visible radiation
    radiationpeak(nm) 355 nm ;range(nm) 340 - 380 nm
    emitted radiation in UV range 100 %
    18 W ; diameter 28 mm ; price 21 units
3) And at least
    UV-A Aquacoral/03 or Super Actinic/03
    radiationpeak(nm) 420 nm ;range(nm) 380 - 470 nm
    emitted radiation in UV range ~60 %
    20 W ; diameter 28 mm ; price 15 units (Aquacoral)
    40 W ; diameter 40,5 mm ; price 19 units (Super Actinic)
The price in "units" only will give you the possibility to compare
these prices.
According to Mike Ware in "The Journal of Photographic Science"
Vol 34. 1986. page 15 :"Quantum yields for the photolysis of aqueous
[Fe(C2O4)3]3-" is light with a wavelength above 420 nm nearly useless in
Iron based sensitizers,so that is the reason that I only give data from
these three tubes.
(I myself use a bank of 10 tubes CLEO 40 W,centre to centre 50 mm,~65 mm
above the film,heat blown away with 6 ventilators from unassorted goods
with a fan diameter ~45 mm,5 V;0,14 A/apiece.Time 1,5 - 3 min.)
The 17th of November 2005 Cor Breukel offered the possibility to measure
the spectrum of light passing through some materials such as glass.
For me he measured the transmission of polyester based films like AGFA
N33p , AGFA CopyJet and MACO Genius Print film and of industrial
polystyrene (not pure)
Combined with data from the SPSE Handbook of Photographic Science and
Engineering 1973,page 312. I can give you transmission data from
> 50 % T > 80 % T
pure polystyrene > 290 nm > 320 nm
pure mylar > 315 nm > 350 nm
industrial polystyrene > 320 nm > 450 nm
polyester based films except CopyJet > 320 nm > 360 nm
CopyJet > 365 nm > 600 nm ?
Window glass > 350 nm > 370 nm
Schott B 270 superwite glass > 320 nm > 360 nm (90 %)

It is a pity that nobody sent a piece of Pictorico to Cor.Now we cannot
compare CopyJet with Pictorico.
Polyester based film is not exposed film after developing and fixing.
For those who are interested in more detailed info ask me OFF LINE and I
will send you the spectral power distribution chart (JPEG 224 kb) and/or
  the transmission chart (JPEG 224 kb)
I couldn't find spectral power distribution data of Sylvania Blacklight
  Blue tubes (F20T12/BLB,F40/BLB and F15T8/BLB,all 356 nm),only from
Icetron Blacklight tubes (100 & 150 Watt) but they are "somewhat" exotic.
Received on 08/19/06-12:07:05 AM Z