RE: alternative to flourescent tubes.

Hello Sandy:

What are your current "base" recommendations for using Pyrocat-HD at 70
degrees Fahrenheit with Efke PL 100 sheet film?

>From my own tests with a SBR of 9, at an EI of 31.9, at 2:2:500; at 70
degrees at 75 minuets, and semi-stand with inversion at 70 minuets, 60
minuets, 40 minuets, and 20 minuets in a thermos bottle; I can tell you that
the details at Zone II with Efke PL 100 are unbelievably sharp, but the
highlights are totally "blown out".

Regards,

Robert J. Triffin

-----Original Message-----
From: Sandy King [mailto:sanking@clemson.edu]
Sent: Tuesday, May 31, 2005 3:41 PM
To: alt-photo-process-l@skyway.usask.ca
Subject: Re: alternative to flourescent tubes.

Yes, I have found the 20 watt screw-in BLB tubes available for around $11.

By my estimation the screw-in tubes have an advantage over straight tubes in
that they produce a lot more radiation for a given area because of their
smaller foot print. For example, a 20 watt BLB screw-in is approximately
2.8"" in diameter, so that if one were to fit them side by side they would
easily go into 3" squares of nine square inches. A 24" BLB tube that puts
out 20 watts is 24" X 1.5" in size, and therefore takes up about 36 square
inches to put out the same amount of radiation, actually more since you
would have to leave at least about a 1/4" space between the tubes, which
brings us to about 40 square inches. In other words, for the same amount of
space the tubes are putting out about four times as much radiation.

Sandy

Those screw in black light fixtures are widely available for less than
$16.95. Google
 Feit BPESL15T/BLB
     One webpage said they were available at Fry's, if there is one near
you.
I have no experience with these bulbs, but it looks like they would work
well for 8x10 (maybe 4 bulbs) and even 11 x 14 (maybe 6 bulbs, maybe only
4).
     The wiring would be a lot less intimidating for beginners.
Charles Portland OR

 
Received on Tue May 31 16:35:02 2005