From: Jeffrey D. Mathias (jeffrey.d.mathias@worldnet.att.net)
Date: 06/19/01-09:31:57 AM Z
shannon stoney wrote:
> ... I read it in Dick Arentz's book. He says that
> of the flourescent tubes you can use for pt/pd printing, black light is the
> least efficient, super actinic is medium, and aquarium lights are most
> efficient. I wonder if this is also true for cyanotypes?
Please do not be confused.
Keep in mind that the bulbs labeled with a BL are not the black lights
referenced. Dick refers to the dark black lights commonly used in head
shops and popular in the '60s to illuminate fluorescent posters and the
like. The BL lamps produce a very bright white looking light that
contains a lot of UV (ultra violet light).
Aquarium and plant lights give off a lot of UV, but the BL lamps are
usually available in much higher outputs. To compare the output of
typical fluorescent lamps, divide the listed wattage by the listed
length. It is the wattage per area that will represent the flux (light
intensity). Since the width (diameter) of the lamp is insignificant
relative to the length, the length can be used as area.
-- Jeffrey D. Mathias http://home.att.net/~jeffrey.d.mathias/
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