Re: flourescent lights

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From: Judy Seigel (jseigel@panix.com)
Date: 06/18/01-10:40:34 PM Z


On Mon, 18 Jun 2001, shannon stoney wrote:

> I tried it with a test strip and a step tablet, and it took an hour to get
> even close to D max! Is this normal? I replaced the cool white and warm
> white bulbs with full spectrum bulbs, and that helped a little, but not
> much.

Shannon, how far apart are the bulbs, and how far from the bulbs is your
paper? Also, why aren't you using black-light fluorescents? With closely
ranked bulbs, and paper about 3 inches away, "normal" flourescent time
(blacklight, that's BL -- not BLB) is 3 to 8 minutes.

I'll add that I've tested the "other" fluorescents; they are markedly
inferior for cyano. In fact you did well to get "D-max" at all. For $10 a
bulb (on web) vs. $5 or so for "regular" fluorescent, it's a false
economy.

See also "Light Carpentry", Post-Factory #6, page 20.

Judy

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