From: Judy Seigel (jseigel@panix.com)
Date: 06/21/01-06:41:47 PM Z
On Thu, 21 Jun 2001, shannon stoney wrote:
> Hi. I bought two black light tubes today for my 4' fixture. They are
> the BLB type, not the BL type. I just did a test strip with a step tablet
> and in ten minutes it printed about ten steps just fine. So, I think it's
> ok to use these BLB tubes, which seem easier to find than the BL tubes, at
> least around here. They work, at least for cyanotypy.
They work for all the processes -- it's essentially the same light, but
slower, because the dark glass cuts out all light that's not at the main
spike. In the old days the BLB cost about 3 times as much as the BL.
Apparently not now.
Judy
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