RE: Question on Metal Halide

Hi Keith, I'm using a mercury vapour lamp originally installed up high
in a factory ceiling.....now I'm using it quite close to the paper for
gum printing and getting about a 18" circle of light (with a large outer
halo - I mean useable consistent light). The most time I've had to use
for a print is 1 1/2 mins, and I'm thinking of lifting it to get more
control. The lamp cost me $NZ 75 from a junk store, and the bulbs are
readily available for about $NZ50. I'm very satisfied with the results
from this lamp, which are indistinguishable as far as I can see from
daylight. Also, it doesn't create much heat at all. I'll find the brand
sticker and send you the details.

Kate

-----Original Message-----
From: Keith Gerling [mailto:Keith@gumphoto.com]
Sent: Friday, 16 July 2004 5:36 p.m.
To: alt-photo-process-l@sask.usask.ca
Subject: Question on Metal Halide

My ancient Violux printing lamp died on me this week. I've been looking
for
a replacement and I've been reading Sandy King's excellent rundown on UV
sources at Unnlinkingeye.com. I'm interested in the HID Metal Halide
and
Mercury Vapor lamps, but I'm concerned about lengthy exposures. Does
anybody here use of these? Any ideas on how long of an exposure I might
need with the bulb far enough away to cast a 40" circle of light?

Thanks

Keith

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