From: Judy Seigel (email@example.com)
Date: 07/13/02-12:04:48 AM Z
On Thu, 11 Jul 2002, Leyba, Matt wrote:
> When I was searching around town for a UV source, I went into a local "grow
> store" and asked for a light with the highest UV output available. He went
> on to explain that grow lights were optimized to actually cut down on some
> UV because plants could get burned just like people do in the sun. I don't
> know if what he said is true or not? I passed on the grow light and picked
> up a 1000W Metal Halide at Grainger. I think it was about $200 with a bulb.
> I average 3min exposures with pd/pt.
When I tried grow lights for cyanotype, they were abysmal -- about 1 hour
for what takes 3 minutes with BL (tho other types of grow light could be
IME there's little if any advantage over BL in metal halide, except you
get to use 1000-2000 watts of electricity instead of a puny 100 - 160, so
you can run your air conditioner more... There may be somewhat more
contrast, but for gum, which has so many controls in emulsion &
development, etc., this seemed irrelevant.
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