From: Dave & Erin (dfisher@nstar.net)
Date: 06/29/00-01:48:01 PM Z
Judy
The sunshine bulb that I found was $5.97 compared to the BLB bulb for
$12.97. That's why I thought I would try it out.
Erin Fisher
----------
>From: Judy Seigel <jseigel@panix.com>
>To: alt-photo-process-l@skyway.usask.ca
>Subject: Re: UV light source
>Date: Thu, Jun 29, 2000, 11:41 AM
>
>
>
> On Thu, 29 Jun 2000, John W. Richardson wrote:
>> The tubes with the blue filter are designated BLB. In the U.S. they
>> are much more expensive thatn the unfiltered BL tubes.
>
> Of course you know there's nothing like a general statement in alt-photo
> to attract contradictions, as flies (is that the insect?) to honey: I
> think it was last year someone from California announced his local store
> was selling the BLB cheaper (maybe a closeout, to make way for a new disco
> style) & since then the price differential has lowered, AFAIK.
>
> BUT, in any event the BLB is NEVER (again guess i should add in my
> experience) better than the BL, I've tested it a bit because my neighbor
> got the BLB by mistake (a costly mistake at that time). Was at least a
> third slower, and depending on paper contrastier, with a steeper top step,
> though depending on negative that could be a plus.
>
> The point is that most every emulsion has some sensitivity at various
> points along the spectrum, and those other wavelengths can contribute to a
> rounder fuller print. Then changes in emulsion can also change sensitivity
> -- in other words, cutting out wavelengths can be useful for spectral
> tests or special effects, but for our purposes is a waste of electricity.
>
> As for "harmful rays" -- I believe the BL bulbs have nought below 360 --
> or if they do the glass filters it out. You shouldn't look directly at ANY
> light bulb, but UV rays don't reach beyond 40 inches ("They" say), and
> if you're working at close range you can get UV goggles for $4. (I suppose
> Today-type people don't know what a broken record is unless in the 100
> meter hurdle, but I/you/we say this at intervals.)
>
> The BL bulbs must also have some visible spectrum light or we wouldn't (I
> think) see their light when lit. You can print many "alt" emulsions by
> other fluorescent bulbs (bright white, daylight, etc.) but often quite
> slow & very high contrast. HOWEVER, that "Sunshine" bulb Erin mentions
> sounds like --well, how could you not try it? Is it expensive? I used to
> test 4x5 negs with just 2 bulbs.... and you could always put them in the
> kitchen or give to your depressed cousin if they don't print (I assume
> they're being marketed for SAD, or "seasonal affective disorder,"
> depression in winter due to lack of UV rays on the inner eyeball.)
>
> Judy
>
> .................................................................
> | Judy Seigel, Editor >
> | World Journal of Post-Factory Photography > "HOW-TO and WHY"
> | info@post-factory.org >
> | <http://rmp.opusis.com/postfactory/postfactory.html>
> .................................................................
>
>
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