RE: Some Lights It Hot, Some Lights It Cold

[Eric Neilsen <ejnphoto@sbcglobal.net>]

You can/could get a Metro Lux II timer and plug in the optional UV sensor.
And practice this in your printing steps; Always warm up the unit before
printing for 10 to 15 minutes. I have not seen the particular light source,
but you may need to adjust the fan speed to reduce the amount of air it is
circulating until the unit warms up. Perhaps Jon can add a switch to prevent
premature cooling. 

Eric

Eric Neilsen Photography
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Suite 9
Dallas, TX 75226
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> -----Original Message-----
> From: Michael Koch-Schulte [mailto:mkochsch@shaw.ca]
> Sent: Thursday, March 08, 2007 8:23 AM
> To: alt-photo-process-l@sask.usask.ca
> Subject: Some Lights It Hot, Some Lights It Cold
> 
> Forgive me the headline, I'm atoning for a life of typos...
> Seriously though, I have a real question... I use a bank of UV BL
> fluorescents to print my work (a la Eepjon). I've been weeding out the
> errors, big and small, in my process lately. I find that when the are hot,
> used within the last half hour, they are anywhere from one-third to
> two-thirds a stop faster than when the lights are "cold". The difference
> makes printing to highlight and calibration (using the term loosely) a
> real
> pain. I know on commercial units there is a sensor which calculates how
> many
> "units" of UV has been emitted so the operator can compensate. Has anyone
> built a similar switch for the smaller light boxes?
> ~m