From: Michael Mutmansky (psu4ever@ix.netcom.com)
Date: 02/11/00-05:02:08 PM Z
William,
As a further thought, I am not too concerned about the output depreciation due to
age since it is predictable and gradual. You aren't going to see any sudden shifts
in the printing times.
I am more intrested in the output of the lamp due to ambient temperature and
voltage drift. As a lamp heats up, the output will increase up to a point, then
the output will decrease. The optimal point is different for every lamp type. The
problem is that the only way for the exposure to be linear with time is to have the
lamps running continuously. If this is the case, then there isn't much to worry
about. The lamps will come up to a 'steady state' condition where the temperature
on the bulb wall is fairly constant, and output of the lamps is also fairly
constant.
I'm not that intrested in running a whole bank of lamps continuously (wasteful of
energy, lamp life, and would require a seperate room to eliminate UV spillage.)
Clearly, there are a bunch of variables that affect exposure time, and an
integrating timer will help eliminate a few of these that are related to the lamp.
---Michael
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