From: Sandy King (sanking@clemson.edu)
Date: 08/15/03-06:46:57 PM Z
I think that most all 1000W metal halide bulbs, regular commercial
luminaires as well as the special bulbs for platemakers such as
NuArc, put out a lot of effective radiation for gum printing. They
all put out a lot of heat, however, so you should use them with a fan.
If you set up a 100OW metal halide bulb in a luminaire fixture at
about 40" from the pod of the bulb to the easel or contact printing
frame you will get an area of even illumination of around 30", with
about a 1/3 stop fall-off at the corners.
I work with both a 1000W metal halide bulb and a large bank of BLB
tubes. Exposure times with the 1000W metal halide bulb at 40" from
the printing frame exposures are comparable to those with the BLB
bank at 5" from the printing frame. You can make excellent prints
with either type light, though one might find advantages in one or
the other depending on a number of circumstances.
The primary advantage of the luminaire type light over a bank of UV
tubes is that no construction is involved. You just buy the fixture
and bulb and assemble and hang it.
Sandy
>Hi Dwayne,
>
>Nobody seems to have answered this, so for what it's worth, if that 1000
>metal halide light is the sort on late unlamented Nu Arc, it's fine for
>gum -- assuming you don't have a problem with other aspects of the 1000
>watt bulb, such as heat, electricity consumption, & tendency to get
>cranky, ie, die of no known cause.... (It seemed to do this for me more
>than for certain fellas, like Sandy King -- pure sexism I'm sure. But I'm
>VERY happy with my cool,inexpensive, low energy consumption blacklight
>fluorescents.)
>
>Judy
>
>On Mon, 11 Aug 2003 sandall@shaw.ca wrote:
>
>> Hi all,
>>
>> I've been reading the list for a while, doing some research on getting
>> into making gum prints. I would like to get people's opinion on using a
>> 1000W metal halide light as a UV source for gum printing. Is this
>> appropriate? Any particulars I should look for if it is?
>>
>> Thanks a ton for your help,
>> Dwayne
>>
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